added pi harness to AI Engineering Coach...

[vanveluwen]

Summary

Added support for the Pi Coding Agent harness to AI Engineer Coach.

New files

• src/core/parser-pi.ts — the Pi session parser:
  • findPiDirs() discovers ~/.pi/agent/sessions/.
  • parsePiSessions(dir) recursively scans **/*.jsonl, parses each file, and returns internal Session objects.
  • Parses the first line as the SessionHeader (version, UUID, timestamp, cwd, parentSession). Falls back to decoding the --encoded-cwd--
    directory name when the header lacks cwd.
  • Folds the linear/tree entry sequence into user→assistant turns (SessionRequests), preserving cwd/workspace path, timestamps, role, model, and
    message content.
  • Captures tool calls (read/write/bash etc.) into edited files, referenced files, tools used, and skills; surfaces written content for AI-code
    detection; tracks per-turn and aggregate token usage (input/output/cache read/write).
  • Safely ignores unsupported entry types (thinking_level_change, compaction, branch_summary, custom, custom_message, label, session_info, and
    unknown future types) and thinking/toolResult content.
• src/core/parser-pi.test.ts — 7 tests covering basic turns, content/model/cwd preservation, tool-call capture, multi-turn splitting, safe ignoring
  of unsupported entries, dir-name cwd fallback, and aggregate modelUsage.

Registration & wiring

• parser-harnesses.ts — registered "Pi Coding Agent" as an external harness collector, added it to hasExternalHarnessSources() and
  EXTERNAL_HARNESS_SET.
• parser-shared.ts — added ~/.pi to trusted path roots.
• shared.ts / page-config.ts — added harness colors for the filter/UI.
• panel.ts — updated the "no logs found" message and comment.
• analyzer-insights.ts — added Pi Coding Agent to the feature-comparison matrix.
• Docs (supported-tools.md, _index.md files) — documented the new harness.

Verified against real Pi logs on disk (4 projects parsed correctly) and the full suite passes (1041 tests), with clean tsc/eslint/cspell.

[vanveluwen]

This needs more review/testing before it is marked ready for review

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