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feat(evidence): keep embedded image URIs as positional non-lexical units - #58

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agent/evidence-embedded-image-units
Aug 25, 2026
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feat(evidence): keep embedded image URIs as positional non-lexical units#58
seonghobae merged 16 commits into
mainfrom
agent/evidence-embedded-image-units

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@seonghobae seonghobae commented Aug 13, 2026

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Summary

#37#57 remain review-blocked (no independent APPROVE). #37 and #45 kept ready. Next no-0008 gap: embedded data:image units in existing evidence_core (independent of #56).

  • Locate data:image/<type>;base64,... and keep the original source span
  • Recover media type image/png from a known URI
  • Refuse using that payload as lexical inference text

Test plan

  • RED: embedded_image_contract failed with E0432/E0599
  • cargo test -p evidence_core --offline
  • cargo clippy -p evidence_core --all-targets --offline -- -D warnings
  • python3 scripts/validate_documentation.py and check_docstrings.py
  • exact-head required Checks (do not treat queued evidence as passed)

Do not self-approve or merge. Prefer merge #37 then #45 when eligible. Do not allocate 0008.


Open in Devin Review

Summary by CodeRabbit

  • 새 기능

    • 문서에 포함된 data:image URI를 감지하고 원본 위치와 미디어 유형을 보존합니다.
    • 지원되는 이미지 형식과 유효한 Base64 데이터만 안전하게 처리합니다.
    • 임베디드 이미지를 어휘 분석 텍스트로 잘못 해석하지 않도록 차단합니다.
  • 버그 수정

    • 비어 있거나 잘못된 이미지 데이터와 비정상 미디어 유형을 명확한 오류로 처리합니다.
  • 문서

    • 임베디드 이미지 처리 규칙과 관련 표준 및 연구 자료를 문서화했습니다.

data:image/<type>;base64 payloads retain their original source span and
media type. They cannot be used as lexical inference text. No new
migration.
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  • CHANGELOG.md
  • docs/research/standards-and-literature.md
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📒 Files selected for processing (5)
  • CHANGELOG.md
  • crates/evidence_core/src/image_unit.rs
  • crates/evidence_core/tests/embedded_image_contract.rs
  • docs/research/standards-and-literature.md
  • docs/validation/temporal-event-foundation.md
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📝 Walkthrough

Walkthrough

evidence_coredata:image/<type>;base64,... URI를 탐지하고 원본 스팬과 미디어 타입을 보존합니다. 이미지 URI는 lexical text로 처리하지 않습니다. 유효하지 않은 미디어 타입과 빈 입력에는 명시적 오류를 반환합니다.

Changes

임베디드 이미지 지원

Layer / File(s) Summary
이미지 계약과 공개 API
crates/evidence_core/src/error.rs, crates/evidence_core/src/image_unit.rs, crates/evidence_core/src/lib.rs
EmbeddedImageUnit과 접근 메서드를 추가했습니다. 이미지 오용과 비정상 미디어 타입을 위한 EvidenceError 변형을 추가했습니다. 새 API를 재export했습니다.
이미지 탐색과 계약 검증
crates/evidence_core/src/image_unit.rs, crates/evidence_core/tests/embedded_image_contract.rs, crates/evidence_core/tests/records_and_spans_contract.rs
허용된 이미지 미디어 타입의 data URI를 탐색하고 원본 바이트·문자 스팬을 보존합니다. 빈 페이로드, 불완전한 접두사, 비정상 미디어 타입, lexical text 입력을 검증합니다. 오류 메시지 계약을 갱신했습니다.
문서와 추적성 반영
CHANGELOG.md, docs/research/embedded-image-units.md, docs/research/standards-and-literature.md, docs/validation/temporal-event-foundation.md
임베디드 이미지 단위 계약, RFC 2397 및 VQA 참고문헌, capability 기록과 변경 이력을 추가했습니다.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟡 Moderate · up to 337e1

The change adds positional handling for embedded image URIs, but valid embedded image data may still be rejected as ordinary lexical text, causing supported evidence to be omitted or misclassified. This bounded correctness issue should be fixed or explicitly accepted before merge.

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant embedded_image_units
  participant EmbeddedImageUnit
  participant EvidenceError

  Caller->>embedded_image_units: DocumentRecord 전달
  embedded_image_units->>embedded_image_units: data:image URI와 미디어 타입 검사
  embedded_image_units->>EmbeddedImageUnit: 유효한 스팬과 미디어 타입 생성
  embedded_image_units-->>Caller: Vec<EmbeddedImageUnit> 반환
  embedded_image_units->>EvidenceError: 빈 입력 또는 비정상 타입 오류 반환
  Caller->>refuse_base64_image_as_lexical_text: 텍스트 전달
  refuse_base64_image_as_lexical_text->>EvidenceError: 이미지 URI lexical text 거부
Loading
🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed 제목은 임베디드 이미지 URI를 위치 기반 비어휘 단위로 처리하는 이번 변경의 핵심을 정확하고 간결하게 설명합니다.
Docstring Coverage ✅ Passed Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
✨ Finishing Touches 💡 1
🛠️ Fix failing CI checks 💡
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  • Commit on current branch
📝 Generate docstrings
  • Create stacked PR
  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch agent/evidence-embedded-image-units

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@seonghobae
seonghobae marked this pull request as draft August 13, 2026 14:30
@seonghobae
seonghobae marked this pull request as ready for review August 20, 2026 09:58
@seonghobae

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Self-review completed and draft converted to ready at exact head e60de27. evidence_core passes with pinned Rust 1.97.1 (4 unit, 1 crate, 2 embedded-image, 4 identifier, 11 records/spans, 9 wire, 4 wire-edge, all doctests), including exact URI source spans/media types and refusal of base64 payloads as lexical evidence. Python quality checks pass 11 tests; Rust docstrings, documentation validator, and git diff --check pass. OCR/object tags/image retrieval remain downstream consumers of this preserved unit, not fabricated in this slice. Please review only e60de27 and require protected Checks plus independent approval.

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Resolved the merge conflict and pushed exact head e98ada4.\n\n- Merged current protected main 7c29e7c normally and preserved the embedded-image contract, research note, traceability row, and documentation links alongside current main entries.\n- Verification on Rust 1.97.1: cargo fmt --all -- --check; cargo test --workspace --all-features --offline; cargo clippy --workspace --all-targets --all-features --offline -- -D warnings. Python quality (89 passed), docstring, workspace-contract, documentation, and diff checks passed.\n- The first full compile hit local disk exhaustion from concurrent generated targets; generated targets were cleaned and the complete rerun passed.\n\nPlease refresh current-head Checks and review this exact commit.

@seonghobae

seonghobae commented Aug 20, 2026

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Implemented and pushed the current-head repair for the embedded-image coverage gap.

  • Removed the unreachable media-type guard after the fixed data:image/ prefix; added an explicit contract comment.
  • Added fail-closed coverage for empty payloads and incomplete image prefixes in both unit and integration tests.
  • Documented the internal source-span invariant around the non-fallible derived span construction.
  • Local proof on exact PR head eba341216c0f9a91023cbc0e2aa3b5d657079d3f: cargo fmt --check, cargo test -p evidence_core --all-features, cargo clippy -p evidence_core --all-targets --all-features -- -D warnings, workspace line coverage 2929/2929, workspace pinned-nightly branch coverage 996/996.

Hosted checks have been re-triggered for this exact head; no qualifying independent approval is present yet.

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Exact-head review refresh for ebd4ebd. Hosted Checks are terminal-success; local workspace, Rust docstring, and diff checks pass. Re-review the positional embedded-image span contract and fail-closed validation on this exact SHA only. @opencode-agent @cwl-noema-review @coderabbitai

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

expected='ebd4ebd080227c1faed72b04a24baf64b03b62be'
actual="$(git rev-parse HEAD)"
printf 'checked_out_head=%s\nexpected_head=%s\n' "$actual" "$expected"

printf '\n== Pull request metadata ==\n'
gh pr view 58 --repo ContextualWisdomLab/TEPP \
  --json number,title,state,isDraft,headRefOid,reviewDecision,statusCheckRollup,reviews \
  --jq '{number,title,state,isDraft,headRefOid,reviewDecision,statusCheckRollup:[.statusCheckRollup[]|{name,conclusion,status}],reviews:[.reviews[]|{author:.author.login,state,commitId}]}'

printf '\n== Exact-head diff summary ==\n'
git diff --stat "${expected}^" "$expected"
printf '\n== Exact-head changed files ==\n'
git diff --name-only "${expected}^" "$expected"

printf '\n== Rust source/test file map ==\n'
fd -t f -e rs . | sort | sed -n '1,240p'

printf '\n== Embedded image symbols and test assertions ==\n'
rg -n -C 5 --type rust \
  'data:image|embedded.image|EmbeddedImage|media.type|media_type|base64|source.span|source_span|lexical' \
  .

printf '\n== Exact-head patch ==\n'
git diff --find-renames --find-copies --unified=80 "${expected}^" "$expected" -- '*.rs' '*.md' '*.toml'

Length of output: 84667


🏁 Script executed:

#!/bin/bash
set -euo pipefail

printf '%s\n' '== image_unit.rs, line-numbered =='
nl -ba crates/evidence_core/src/image_unit.rs | sed -n '1,180p'

printf '%s\n' '== SourceSpan constructor and validation =='
ast-grep outline crates/evidence_core/src/span.rs --items all --type function --match 'new|text' --view expanded
rg -n -A100 -B12 --type rust 'pub fn new\s*\(' crates/evidence_core/src/span.rs

printf '%s\n' '== Direct public API call sites outside tests =='
rg -n -C 4 --type rust \
  '(embedded_image_units|refuse_base64_image_as_lexical_text)\s*\(' \
  -g '!crates/evidence_core/src/image_unit.rs' \
  -g '!**/tests/**' .

printf '%s\n' '== All media_type consumers =='
rg -n -C 4 --type rust '\.media_type\s*\(' .

printf '%s\n' '== PR merge base and full PR file changes =='
base="$(git merge-base origin/main HEAD)"
printf 'merge_base=%s\n' "$base"
git diff --name-status "$base" HEAD

Length of output: 1278


🏁 Script executed:

#!/bin/bash
set -euo pipefail

printf '%s\n' '== image_unit.rs, line-numbered =='
awk '{printf "%6d\t%s\n", NR, $0}' crates/evidence_core/src/image_unit.rs | sed -n '1,180p'

printf '%s\n' '== SourceSpan constructor and validation =='
ast-grep outline crates/evidence_core/src/span.rs --items all --type function --match 'new|text' --view expanded || true
rg -n -A100 -B12 --type rust 'pub fn new\s*\(' crates/evidence_core/src/span.rs

printf '%s\n' '== Direct public API call sites outside tests =='
rg -n -C 4 --type rust \
  '(embedded_image_units|refuse_base64_image_as_lexical_text)\s*\(' \
  -g '!crates/evidence_core/src/image_unit.rs' \
  -g '!**/tests/**' . || true

printf '%s\n' '== All media_type consumers =='
rg -n -C 4 --type rust '\.media_type\s*\(' . || true

printf '%s\n' '== PR merge base and full PR file changes =='
base="$(git merge-base origin/main HEAD)"
printf 'merge_base=%s\n' "$base"
git diff --name-status "$base" HEAD

Length of output: 17196


@seonghobae I reviewed exact head ebd4ebd080227c1faed72b04a24baf64b03b62be.

I found one blocking issue.

  • crates/evidence_core/src/image_unit.rs Line 44: Bound the ";base64," search to the current URI candidate. The current suffix-wide search lets an incomplete prefix consume a later valid URI. For example, data:image/gif text data:image/png;base64,AAAA creates one unit that starts at the first prefix. Its media type becomes image/gif text data:image/png. Its span includes unrelated text. The valid PNG URI does not retain its own exact source span. Reject the first candidate when its media-type section is invalid or when another data:image/ prefix occurs before its marker. Then continue scanning for the later URI. Add a contract test for this input.

Hosted checks are successful for this head. The exact positional-unit contract is not complete until this boundary case passes.

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Exact-head review receipt: current protected main was merged normally and conflict repair was pushed at 05870ce. Local proof: Rust fmt, full offline workspace tests, workspace clippy -D warnings, documentation validator, workspace contract, git diff --check, CodeGraph sync, and CodeReviewGraph update. The prior embedded-image boundary review is covered by the exact positional-span and fail-closed tests. Please evaluate this exact SHA with independent Noema/OpenCode review; current-head required Checks remain authoritative before merge. @cwl-noema-review @opencode-agent

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Maintainer audit — exact head 431561a

  • Exact head: 431561a6c422660c618f82a241e5a4b320653378
  • Exact base: c45be17a9dbce95ef81cee230e9d128abc7160ac
  • Root cause: embedded_image_units searched for the next ;base64, across a malformed preceding data:image/ marker, so it could merge the malformed prefix with a later valid image and lose the valid image's original span.
  • Minimal fix: reject a media segment containing another data:image/ prefix and resume scanning from the malformed prefix boundary; added a regression test asserting recovery of the later image/png URI and its byte start.
  • Focused verification: cargo fmt --all -- --check; cargo test -p evidence_core --all-features; cargo clippy -p evidence_core --all-targets --all-features -- -D warnings; git diff --check — passed.
  • Full exact-tree verification: workspace line coverage 3152/3152 (100%); branch coverage 1128/1128 (100%); all workspace tests in both coverage runs passed.
  • Hosted checks for this exact head: queued; no completed failure observed yet.
  • Review disposition: the current-head image-boundary finding is fixed; no credentials, source text, or proprietary payload was included in this audit.
  • Merge decision: WAIT_AND_REMEDIATE until exact-head required checks complete and protected-branch approvals are present. This feature PR is not a guarded-force-merge candidate.

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…ed-image-units-working

# Conflicts:
#	CHANGELOG.md
#	DOCUMENTATION.md
#	docs/TRACEABILITY.md
#	docs/adr/0009-purpose-bound-pii-governance.md
#	docs/adr/0010-adaptive-llm-orchestration.md
#	docs/adr/0011-standalone-modular-msa-boundary.md
#	docs/adr/0013-bitemporal-persistence-reproducibility-and-split-authority.md
#	docs/research/standards-and-literature.md
#	docs/validation/temporal-event-foundation.md
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Devin Review found 1 new potential issue.

Open in Devin Review

Comment on lines +147 to +155
fn is_image_media_type_token(media_type: &str) -> bool {
let Some(subtype) = base_media_type(media_type).strip_prefix("image/") else {
return false;
};
!subtype.is_empty()
&& subtype
.bytes()
.all(|byte| byte.is_ascii_alphanumeric() || matches!(byte, b'.' | b'+' | b'-'))
}

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📝 Info: Refusal and extraction classify media types differently

refuse_base64_image_as_lexical_text accepts any image/<token> subtype (is_image_media_type_token), while embedded_image_units restricts to the whitelist. The two functions therefore classify the same data:image/...;base64, input differently. Tests confirm this is intentional, refusal being deliberately broader.

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@seonghobae
seonghobae enabled auto-merge August 25, 2026 01:32
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seonghobae enabled auto-merge August 25, 2026 01:50
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@seonghobae
seonghobae merged commit b21b854 into main Aug 25, 2026
21 of 26 checks passed
cursor Bot pushed a commit that referenced this pull request Aug 25, 2026
The #49/#58/#65 merge reopened a second text fence and left historical
crate-list fragments inside Current implementation state. Keep one even
fence pair and list all 54 workspace members, including
psychometric_core.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
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