[No QA] Automate PR checklist batch 2: callback naming, prop docs, file headers

[kacper-mikolajczak]

Explanation of Change

Phase 2 (batch 2) of automating the deterministic PR-checklist items behind the code-inline-reviewer, following the merged Phase 1 (#92926). Converts three more checklist items into auto-discovered reviewer rules and trims the checklists accordingly.

New reviewer rules (.claude/skills/coding-standards/rules/, also registered in SKILL.md):

Rule	Enforces	Replaces checklist item
CONSISTENCY-12	Callbacks named for the action, not the event (toggleReport not onIconClick)	author + reviewer "callback methods ... named for what the method does"
CONSISTENCY-13	Component props carry a /** */ block comment (presence check; complements CONSISTENCY-10 which owns style + mixed cases, so no double-flag)	reviewer "each prop has a /** comment above it */"
CONSISTENCY-14	Non-trivial new files start with a header description comment	author + reviewer "file has a description ... at the top"

Checklist trims

• Removed the 3 converted items above from PULL_REQUEST_TEMPLATE.md and REVIEWER_CHECKLIST.md.
• Removed reviewer lines already dead-covered by existing rules: "file is named correctly" (CONSISTENCY-9), "only data ... necessary for rendering" (CLEAN-REACT-5), and the three Class Component this-binding / render-method items (moot under CLEAN-REACT-8, which bans class components).

⚠️ Merge ordering

Trimming REVIEWER_CHECKLIST.md shortens it, which re-triggers the exact regression fixed by #94161 (the reviewer-checklist action caps completed items at count + 2). #94161 must merge before this PR or in-flight reviewer checklists written against the longer template will fail.

Fixed Issues

$ #92599

Tests

Deterministic rule/markdown changes; no runtime surface. Verified by inspection that each removed checklist line maps to a rule that enforces it (table above).

• Verify that no errors appear in the JS console

QA Steps

[No QA]

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above

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[kacper-mikolajczak]

Reopening from the Callstack internal fork (callstack-internal/Expensify-App) - superseded by #95546.