planning: add issue 2.1-update-license-header-conventions

Author: cowwoc

.claude/cat/issues/v2/v2.1/update-license-header-conventions/PLAN.md

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+# Plan: Update License Header Conventions
+
+## Goal
+Correct and consolidate license header conventions: move the authoritative documentation into project conventions,
+fix exemptions, add headers to `first-use.md` files, and scrub existing headers from exempt locations.
+
+## Execution Steps
+
+1. **Move license-header.md to project conventions**
+   - Move `plugin/concepts/license-header.md` to `.claude/rules/license-header.md`
+   - Update any references to the old path
+
+2. **Update exemptions in license-header.md**
+   - Replace separate `.claude/cat/issues/` and `.claude/cat/` config entries with a single entry:
+     `Files in .claude/cat/` (planning artifacts, config, runtime data)
+   - Add exemption: `SKILL.md` files remain exempt; `first-use.md` files require headers
+
+3. **Add license headers to first-use.md files**
+   - Scan `plugin/skills/**/first-use.md` and add HTML comment header to each
+
+4. **Remove license headers from all exempt locations**
+   - Scan `.claude/cat/**` for files containing `Copyright (c) 2026` and remove the header block
+   - Scan `plugin/skills/**/SKILL.md` for any headers and remove them
+   - Scan `plugin/agents/**/*.md` for any headers and remove them
+
+## Post-conditions
+
+- `license-header.md` lives in `.claude/rules/`, not `plugin/concepts/`
+- All `first-use.md` files have license headers
+- No `SKILL.md` files have license headers
+- No files under `.claude/cat/` have license headers
+- No `plugin/agents/` markdown files have license headers
+- `mvn verify` passes

.claude/cat/issues/v2/v2.1/update-license-header-conventions/STATE.md

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+# State
+
+- **Status:** open
+- **Progress:** 0%
+- **Dependencies:** []
+- **Blocks:** []
+- **Last Updated:** 2026-02-26