Add save-plan skill

claude/skills/save-plan/SKILL.md

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+---
+name: save-plan
+description: Save the current plan to ~/.claude/plans/
+disable-model-invocation: true
+user-invocable: true
+---
+
+# Save Plan
+
+Save the plan from the current session to `~/.claude/plans/`, organized by repo and branch.
+
+## Directory structure
+
+```
+~/.claude/plans/<repo-name>/<branch-name>/
+  YYYY-MM-DD-HHMMSS.md
+```
+
+- `<repo-name>`: basename of the git repo root (e.g. `dotfiles`)
+- `<branch-name>`: current git branch or worktree branch (e.g. `add/auth-middleware`)
+
+Example: `~/.claude/plans/dotfiles/add/auth-middleware/2026-02-14-143022.md`
+
+## Steps
+
+1. Detect the git repo name (`git rev-parse --show-toplevel | xargs basename`) and current branch (`git branch --show-current`).
+2. Create `~/.claude/plans/<repo>/<branch>/` if it doesn't exist.
+3. Write the plan as a markdown file named `YYYY-MM-DD-HHMMSS.md` (timestamp at time of save).
+4. Include a YAML frontmatter block at the top with:
+   - `date`: full ISO 8601 timestamp
+   - `repo`: repo name
+   - `branch`: branch name
+5. Then include the full plan content as markdown.
+6. Confirm the file path to the user.