fix(agents): respect markdown code spans when stripping thinking tags

[ngutman]

Summary

The stripBlockTags function in pi-embedded-subscribe.ts was incorrectly matching <thinking> tags inside markdown code spans (backticks), causing message content to be truncated.

For example, a message like:

fixes leaked `<thinking>` tags

would have everything after the backtick-enclosed <thinking> stripped, because the regex did not understand markdown context.

Changes

• Added findCodeSpanRanges() helper to identify inline code (`) and fenced code blocks (```) in text
• Added isInsideCodeSpan() helper to check if an index falls within code spans
• Modified stripBlockTags() to skip thinking tag matches that fall inside code spans
• Added 3 tests for the new behavior

Test Plan

• 3 new unit tests for code span awareness pass
• All 53 pi-embedded-subscribe tests pass
• TypeScript type check passes

Context

When discussing code changes related to thinking tags (e.g., documenting what was fixed), the streaming output would be incorrectly truncated.

🤖 Generated with Clawdbot

[steipete]

Ha what model was that? That's some hacky slop xD

  Yes, current approach is hacky. Cleaner path: reuse existing markdown
  fence parser + add a tiny inline-code span parser with streaming state.
  No bespoke regex-by-index per call.

  Clean approach outline:

  - Reuse parseFenceSpans from src/markdown/fences.ts for fenced blocks
    (handles indent + 3+ ticks/tilde).
  - Add parseInlineCodeSpans once in src/markdown/inline-code.ts (single-
    pass state machine; supports multiple backtick lengths; treats
    unclosed as open-to-end).
  - In stripBlockTags, skip matches if isInFenceSpan || isInInlineSpan.
  - Keep state across chunks: track inlineCodeOpen + inlineTickLen in
    state.blockState, so chunked streaming can’t break inline detection.

[steipete]

Appreciate the bug report tho!

[ngutman]

@steipete running slopus - anthropic/claude-opus-4-5 🙈
should have chose codex for this haha

[ngutman]

Closing - fix already merged to main in 7e1e7ba by @steipete. Thanks for the review feedback!

(clawdbot did that ^^ 🦞)