fix: round 2 of the release review of 6.3.0

Round 2 (v6.2.0..0d044f6, BLOCK: 2 BLOCKER, 11 MAJOR, 1 MINOR), each fixed
behind a test that failed first.

- The git runner checks only words /bin/sh passes through unchanged (no
  quote, backslash, $, glob or brace) and refuses --output and its
  abbreviations: round 1's --output refusal was bypassed by quoting.
- fieldPaths: backticked paths are kept as written, parentheses and all; in
  plain text every path-like word counts, and a parenthesised note does not.
- plan-validator --steps-from reads the plan's ## Verification for an
  appended End-to-end step, and warns instead of failing under --soft.
- regression-check prints progress_status, the value progress.json takes;
  /trekexecute copies it.
- release-check: a plugin in a subdirectory is checked in its own directory,
  the suite is not run when a cheaper check already makes the answer exit 2,
  and a bad argument or a crash is exit 2.
- Skill routing looks a skill up among skills only, and builds the corpus
  vectors once.
- /trekexecute Phase 7.2 says plainly that remediation steps in the review
  template's own form stop with a re-plan; making them runnable is a later
  order (operator 2026-10-10).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/fixtures/jsonl-schemas.md

@@ -22,7 +22,7 @@
 | trekbrief-stats | ts, task, slug, mode, interview_turns, review_iterations, brief_quality, research_topics, auto_research, auto_result, intent_approved, project_dir, order_id, order_claimed_at, order_reason | commands/trekbrief.md (orchestrator-emit Phase 7; order_* added by lib/stats/stats-append.mjs) | trekbrief.md:1130-1145 | profile, phase_models, profile_source | none |
 | trekresearch-stats | ts, question, mode, scope, engine, slug, project_dir, brief_path, dimensions, dimensions_baseline, dimensions_baseline_preserved, effort, conv_turns, empty_turns, unique_sources, agents_local, agents_external, gemini_used, confidence, contradictions, open_questions | lib/stats/stats-append.mjs (trekresearch.md Stats tracking) | trekresearch.md:782-808 | profile, phase_models, parallel_agents, external_research_enabled, profile_source | none |
 | trekplan-stats | ts, task, mode, slug, brief_path, project_dir, codebase_size, codebase_files, agents_deployed, deep_dives, research_briefs_used, research_scout_used, critic_verdict, guardian_verdict, outcome | lib/stats/stats-append.mjs (trekplan.md Phase 12) | trekplan.md:1115-1135 | profile, phase_models, parallel_agents, profile_source | none |
-| trekexecute-stats (Phase 9 record) | ts, plan, plan_type, mode, result, steps_total, steps_passed, steps_failed, steps_skipped, failed_at_step | lib/stats/stats-append.mjs (trekexecute.md Phase 9) | trekexecute.md:2867-2889 | profile, phase_models, profile_source | none |
+| trekexecute-stats (Phase 9 record) | ts, plan, plan_type, mode, result, steps_total, steps_passed, steps_failed, steps_skipped, failed_at_step | lib/stats/stats-append.mjs (trekexecute.md Phase 9) | trekexecute.md:2877-2899 | profile, phase_models, profile_source | none |
 | trekexecute-stats (autonomy events) | ts, event, known_event, payload | lib/stats/event-emit.mjs `emit()` | event-emit.mjs:78-99 | payload.profile, payload.phase_models, payload.profile_source | none |
 | trekexecute-stats (PostToolUse Bash) | ts, session_id, command_excerpt, duration_ms, success | hooks/scripts/post-bash-stats.mjs (Bash PostToolUse) | post-bash-stats.mjs:42-54 | none (hook is plugin-level, not profile-aware) | command_excerpt (CWE-212) |
 | trekreview-stats | ts, slug, verdict, counts (BLOCKER/MAJOR/MINOR/SUGGESTION), reviewed_files_count, mode, duration_ms | lib/stats/stats-append.mjs (trekreview.md Phase 8) | trekreview.md:628-632 | profile, phase_models, profile_source | none |