[refactor] idd-implement/SKILL.md has CRLF line endings — trips git diff --check

[kiki830621]

Problem

plugins/issue-driven-dev/skills/idd-implement/SKILL.md has CRLF line terminators throughout (632 CR characters; file reports "with CRLF line terminators"). The sibling skill files (idd-all, idd-verify, idd-all-chain SKILL.md, pr-flow.md) are LF.

When any line in this file is edited, git diff --check flags the touched line as trailing whitespace — the \r before \n reads as trailing whitespace. Observed on PR #94 (the #87/#74 auto-close-trap cluster): the reworded line 487 tripped git diff --check.

Type

refactor (file hygiene / line-ending normalization)

Impact

• Cosmetic CI noise — any future edit to this file trips git diff --check on the touched line.
• If CI ever runs git diff --check as a gate, edits to this file would fail it.
• Inconsistent with the other IDD skill files (LF).

Suggested fix

Convert idd-implement/SKILL.md from CRLF to LF in a dedicated commit (dos2unix or sed). Whole-file change (~632 lines) so it must be its own commit/PR — bundling into a logic change makes the logic diff unreadable. Consider a .gitattributes entry (*.md text eol=lf) to prevent recurrence.

Source

Surfaced during /idd-verify --pr 94 R1 verify (Codex reviewer non-blocking note) — the #87/#74 auto-close-trap cluster. Deliberately kept out of PR #94's scope (a 632-line line-ending diff would dwarf the 4-line logic fix).

Related: #87, #74