docs: add draw.io flow diagram for the skill

[phj6688]

Adds docs/linear-issue-craft-flow.drawio, a one-page map of what the skill does end to end so a new user can see the whole pipeline at a glance.

What it shows

• Trigger → Classify (archetype decision tree: Epic / Story / Hardening / Task / decompose, plus interactive vs headless mode) → Draft → Validate (Gate 1 validator, Gate 2 judgment, Gate 3 independent reviewer, or the save-hook in headless mode) → File (save_issue, with the PreToolUse gate re-check).
• The Anchor primitive and where the held-out probe binds.
• The downstream compiler pipeline the issue feeds (planner, held-out probe, implementer, reviewer, merge gate) that explains why concreteness is the product.
• The nine golden rules as a footer.

Themed to the house palette. Also linked from the README and noted in the CHANGELOG.

Docs-only: no code paths touched, so CI (skill/manifest validation, ruff, tests) is unaffected.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 438ea54c-7d80-4560-8d7c-11fac20ae48b

📥 Commits

Reviewing files that changed from the base of the PR and between 4b4287a and 2febced.

📒 Files selected for processing (3)

• CHANGELOG.md
• README.md
• docs/linear-issue-craft-flow.drawio

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/skill-flow-diagram

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