List a channel thread's replies with message list --message-id

[aberoham]

message list --team --channel returns thread roots only, so a caller could not tell whether a question had already been answered without knowing every reply id in advance. Passing the root id now lists the replies under it, paged like any other listing.

• teams message list --team T --channel C --message-id ROOT lists the replies under one channel thread root through GET .../messages/{id}/replies, with $top and --all-pages behaving as they do for the channel listing. --message-id requires --channel and refuses to combine with --chat, where the chat branch would otherwise ignore it.
• teams message reply --mention USER (repeatable) tags a person in a threaded reply the same way message send --mention from Tag people with a real Teams @mention via message send --mention #78 does, so a name in a reply notifies rather than merely appears. A mention alone is a valid body, as on send.
• Tests: the replies listing is driven against a mock Graph through the same _at shape the other API tests use, so the URL and the $top paging are checked without a token. Command-line tests cover the help text and the requires and conflicts_with guards.

Verified live against a real channel thread: one call with --all-pages returned all 24 replies with full bodies.

🤖 Generated with Claude Code

https://claude.ai/code/session_018pgqhqb5eVNMPR214KnpD2

[aberoham]

Follow-up review fixes are in e68438c:

• Send and reply now share the same message-payload builder, so raw at-tag markup is rejected before resolved mentions are applied.
• Added regression coverage for the shared validation path and explicit help-json coverage for both new flags.
• Synchronized README, command reference, examples, and shipped man pages with thread-reply listing and reply mentions.
• Narrowed the changelog wording and stopped promising an ordering stronger than the Microsoft Graph contract.

Verification:

• cargo fmt -- --check
• cargo check --all-targets
• cargo clippy --all-targets -- -D warnings
• cargo test --all-targets: 313 passed
• mandoc lint: no new warnings; one pre-existing line-length style warning remains at teams.1 line 107

[aberoham]

author was claude w/fable-5.1, reviewer was codex w/gpt-5.6-sol xhigh