feat(feishu): render markdown tables via Card-Kit 2.0 interactive cards

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What does this PR do?

Feishu post-type messages with tag: "md" elements do not render GitHub-style pipe tables — table content arrives as raw or dropped markup. This PR detects markdown table blocks in outbound messages and renders them as interactive cards using the Card-Kit 2.0 native table component, the only stable table rendering path in Feishu. Prose around a table is preserved as markdown card elements in the same card.

Type of Change

• ✨ New feature (non-breaking change that adds functionality)
• ✅ Tests (adding or improving test coverage)

Changes Made

• plugins/platforms/feishu/adapter.py
  • Detect GFM pipe tables in _build_outbound_payload before the generic markdown path
  • Build Card-Kit 2.0 interactive cards (schema: "2.0") with native table elements (column-keyed rows) for multi-column tables
  • Fall back to an ASCII code-fence table inside a post message for single-column/degenerate tables or card build failures
  • New config toggle platforms.feishu.extra.table_mode: "card" (default, Card-Kit) | "ascii" (always ASCII code-fence)
  • _build_outbound_payload reads the table mode defensively (getattr with a "card" default) so it keeps working on bare instances, per the test contract in tests/gateway/test_feishu_table_markdown.py
• tests/gateway/test_feishu.py
  • test_send_uses_interactive_card_for_markdown_table: asserts msg_type=interactive, schema: "2.0", and a native table element with the expected column-keyed rows
• tests/gateway/test_feishu_table_markdown.py
  • Keeps the Feishu adapter incorrectly downgrades markdown tables to plain text #52786 / [Bug]: Feishu adapter strips all Markdown formatting when message contains a table #23938 intent: a table-shaped message must never be downgraded to plain text
  • The default-mode test now asserts the interactive Card-Kit path (previously asserted post; the rendering path is what changed, not the no-downgrade guarantee)
  • New test for table_mode="ascii" asserting the post + ASCII code-fence path

How to Test

1. Configure the Feishu platform (default settings, or explicitly platforms.feishu.extra.table_mode: card)
2. Send a message containing a markdown pipe table, e.g. | A | B |\n|---|---|\n| 1 | 2 |
3. The message arrives as an interactive card with a rendered table; surrounding prose renders as card markdown
4. Set table_mode: ascii and repeat — the table arrives as a code-fenced ASCII table inside a post message
5. Run the adapter tests:
   • python -m pytest tests/gateway/test_feishu.py tests/gateway/test_feishu_table_markdown.py -q (79 passed)

Relationship to #52786 and Existing Similar PRs

• Feishu adapter incorrectly downgrades markdown tables to plain text #52786 (and older [Bug]: Feishu adapter strips all Markdown formatting when message contains a table #23938) fixed the table-downgrade-to-text bug; its test in test_feishu_table_markdown.py is updated here because the table rendering path changed from post/md to interactive Card-Kit. The no-downgrade guarantee the regression test protects is preserved.
• feat(feishu): render markdown tables as native Feishu card table components #46727, feat(feishu): render Markdown tables as native card table component #38453 modify gateway/platforms/feishu.py, which no longer exists on main (the Feishu adapter moved to plugins/platforms/feishu/adapter.py) — stale
• fix(feishu): render markdown tables as Card v2 native table components #61496, feat(feishu): render Markdown tables as interactive cards #62926 modify the current adapter path but ship no tests (tests are required for features per CONTRIBUTING.md)
• This PR: current-architecture path, test coverage, table_mode config toggle, and ASCII fallback for degenerate tables

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (feat(feishu):)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this feature (no unrelated commits)
• I've run the relevant tests and they pass: tests/gateway/test_feishu.py + tests/gateway/test_feishu_table_markdown.py 79/79; tests/gateway/ full directory 4847 passed (4 pre-existing failures in test_feishu_approval_buttons.py, test_discord_send.py, test_session_store_prune.py are unrelated to this PR — those files are untouched)
• I've added tests for my changes
• I've tested on my platform: Ubuntu 22.04 (Linux) via a live Feishu gateway

Documentation & Housekeeping

• I've updated relevant documentation (docstrings) — N/A for README/docs
• cli-config.yaml.example — N/A: the new key is a per-platform extra passthrough (same mechanism as existing keys such as require_mention)
• I've updated CONTRIBUTING.md or AGENTS.md — N/A (no architecture or workflow change)
• I've considered cross-platform impact — N/A (pure Python, no OS-specific code)
• I've updated tool descriptions/schemas — N/A (no tool behavior change)

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This was generated by AI during triage.

Duplicate of #12114: both route Feishu markdown tables to Card 2.0 interactive cards using native table elements.

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Thanks for the triage note. I searched existing PRs (including #12114) before opening this one, and I'd respectfully push back on the duplicate flag — the two PRs are not on comparable bases:

• fix(feishu): render markdown tables via card v2 table component #12114 modifies gateway/platforms/feishu.py, a path that no longer exists on main (the Feishu adapter moved to plugins/platforms/feishu/adapter.py). GitHub currently reports fix(feishu): render markdown tables via card v2 table component #12114 as mergeable=False / mergeable_state=dirty, so it cannot be merged as-is.
• This PR (feat(feishu): render markdown tables via Card-Kit 2.0 interactive cards #79410) targets the current adapter path (plugins/platforms/feishu/adapter.py) with the same Card JSON v2 / native table approach, and additionally ships:
  • test coverage (test_send_uses_interactive_card_for_markdown_table + updated tests/gateway/test_feishu_table_markdown.py)
  • a platforms.feishu.extra.table_mode config toggle (card default | ascii)
  • ASCII code-fence fallback for single-column/degenerate tables

For reference, the same stale-path issue applies to #46727 and #38453 (both modify gateway/platforms/feishu.py), and #61496/#62926 target the current path but ship no tests. If maintainers prefer to consolidate the surviving implementations, I'm happy to rebase or coordinate — otherwise, could this be re-checked?