Release v0.7.0

[sionsmith]

Cuts v0.7.0 with everything merged since v0.6.0 (#89–#94).

Added

• message send --subject on channel root messages (fix: preserve chatMessage subject on reads and add message send --subject #90)
• message list --message-id ROOT to list a channel thread's replies (List a channel thread's replies with message list --message-id #91)
• message reply --mention (List a channel thread's replies with message list --message-id #91)
• presence set-preferred / presence clear-preferred (Add presence set-preferred and clear-preferred #92)

Changed

• uuid 1.26.0, rand 0.9.3 (clears RUSTSEC-2026-0097)

Fixed

• Windows 8 MiB main-thread stack (Reserve an 8 MiB main-thread stack on Windows #94)
• Plain lists keep optional fields; human message lists gain a Subject column; message list/get keep subject (fix: preserve chatMessage subject on reads and add message send --subject #90)
• Chat attachments are shared with the chat's members after upload (Share chat attachments with the chat's members after upload #93)

Release checklist

• Cargo.toml and root Cargo.lock entry bumped to 0.7.0
• CHANGELOG "Unreleased" turned into ## v0.7.0 - 2026-09-06, empty Unreleased kept
• fmt / check / clippy -D warnings / test (267 unit + 78 integration) / build --release --locked / cargo audit / git diff --check all pass locally
• mandoc -Tlint clean (one over-long text line wrapped; rendering unchanged)
• Live smoke with the release binary against the self-only sandbox chat: auth doctor, user me, chat list, message send, message list (subject retained in JSON, Subject column in plain output), presence get; --subject with --chat rejected locally with exit 2; presence set-preferred without Presence.ReadWrite returns the 403 scope hint

Merging triggers auto-tag.yml → v0.7.0 → release.yml (5 builds, GitHub release, Homebrew tap, Scoop bucket, docs cli-released dispatch).

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