[APIView Copilot] Include full comment thread in Report Issue context

[helen229]

Summary

When a user clicks Report Issue on a comment in APIView, the backend currently sees only the anchor comment — sibling replies in the same thread are dropped, so the LLM has no view of the conversation that motivated the report.

This PR fetches the full thread and renders it for the LLM.

Changes

_apiview.py — get_comment_with_context

• After loading the anchor comment, runs a second query against the Comments container filtered by ThreadId, ordered by CreatedOn ASC.
• Drops IsDeleted entries; falls back to [anchor] when no siblings exist or the lookup fails.
• Exposes the list as a new thread_comments field in the return dict (the anchor comment shape is unchanged).

_report_issue.py

• _lookup_comment_context forwards the thread as a normalized list of {id, comment_text, comment_source, created_by, created_on} dicts.
• _format_comment_context_for_prompt emits a chronological Thread: transcript (@author (timestamp): text) only when the thread has 2+ comments. Single-comment threads keep the existing one-line Comment: rendering.

generate_issue.prompty

• Documents the new Thread: block in the comment_context description so the LLM knows to use the full transcript instead of only the anchor Comment: line.

Tests

• Updated TestLookupCommentContext.test_maps_db_payload_to_comment_context to assert the new thread_comments mapping.
• Added two transcript-rendering tests:
  • test_single_comment_thread_does_not_emit_transcript
  • test_multi_comment_thread_emits_transcript
• All 61 tests pass.

Follow-up

Pairs with the FE fix on PR #15347 (commit c2a75678a) which makes the dialog card use the clicked comment instead of comments[0].

[Copilot]

Pull request overview

This PR improves the APIView Copilot “Report Issue” flow by including the full comment thread (not just the anchor comment) in the context sent to the LLM and (when needed) in the deterministic fallback issue body, enabling better issue triage from the surrounding discussion.

Changes:

• Extend APIView DB lookup to fetch all comments in the same ThreadId (chronological) and return them as thread_comments.
• Update report-issue context mapping and prompt formatting to optionally emit a Thread: transcript when 2+ comments exist.
• Update the prompt documentation and unit tests to reflect and verify the new thread behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
packages/python-packages/apiview-copilot/src/_apiview.py	Adds thread-level Cosmos query and returns thread_comments alongside the anchor comment context.
packages/python-packages/apiview-copilot/src/_report_issue.py	Normalizes thread comment payload and formats a Thread: transcript for the prompt/fallback body.
packages/python-packages/apiview-copilot/prompts/report_issue/generate_issue.prompty	Documents the new Thread: block semantics for the LLM.
packages/python-packages/apiview-copilot/tests/report_issue_test.py	Adds/updates tests for thread mapping and transcript rendering behavior.