Migrate -- Version Upgrade System

This skill handles version-to-version upgrades using sequential, idempotent migration steps. Each version transition has a dedicated reference file containing Check/Action/Verify steps, making migrations safe to re-run on partial completions and easy to extend for future versions.

1. Version Detection

Current Installed Version

Primary method: Find the installed version directory.

ls ~/.claude/plugins/cache/ai-launchpad/personal-assistant/

List directories, find the highest version number, and read its .claude-plugin/plugin.json to get the version field.

Fallback fingerprinting (when plugin.json is not reliable):

Signal	Inferred Version
No `~/.claude/.context/` directory	Not installed -- tell user to run `/personal-assistant:setup` and stop
`UserPromptSubmit` in plugin hooks, no `~/.claude/rules/elle-core.md`	v1.0.0
`SessionStart` in plugin hooks + `elle-core.md` exists, no `~/.claude/.context/core/improvements.md`	v1.9.0
`SessionStart` + `elle-core.md` + `improvements.md` exists	v1.10.0
Full v2 state (migrate skill exists in installed plugin)	v2.0.0

Target Version

Read ${CLAUDE_PLUGIN_ROOT}/.claude-plugin/plugin.json to get the version of the plugin source being installed.

If current == target: report "Already current. Run /evolve to check for platform upgrades." and stop.

2. Migration Chain

List available migration files from ${CLAUDE_SKILL_DIR}/references/migrations/. Each file is named vX.Y.Z-to-vA.B.C.md.

Parse filenames to build an ordered chain from current version to target version.

Example: if current is v1.10.0 and target is v2.1.0, chain is: v1.10.0 -> v2.0.0, v2.0.0 -> v2.1.0.

For each migration in the chain, read its ## Summary section and present the plan:

Migration path: v1.10.0 -> v2.0.0 -> v2.1.0

Step 1 (v1.10.0 -> v2.0.0):
- Replaces UserPromptSubmit hook with native rules delivery
- ~95% token savings

Step 2 (v2.0.0 -> v2.1.0):
- [summary from file]

Proceed?

Wait for user confirmation before continuing.

3. Backup

Create a timestamped backup before making any changes:

mkdir -p ~/.claude/.context-backups/ && cp -r ~/.claude/.context/ ~/.claude/.context-backups/$(date +%Y%m%d-%H%M%S)/

Verify backup was created:

ls -la ~/.claude/.context-backups/

REQUIRED: DO NOT proceed if backup fails. This is a hard gate.

4. Execute Migration Chain

For each migration in the chain:

Read the migration reference file from ${CLAUDE_SKILL_DIR}/references/migrations/
For each step in the ## Steps section:
- Run the Check command -- if it exits 0, the step is already done, skip it
- Run the Action command
- Run the Verify command -- if it fails, stop immediately and report the failure
After each migration file completes, report: "Migration vX.Y.Z -> vA.B.C complete. N steps executed, M skipped (already done)."

If any step fails:

Stop immediately
Report which step failed and the error
Provide restore instructions: cp -r ~/.claude/.context-backups/[timestamp]/ ~/.claude/.context/

5. Verify and Report

After all migrations complete, verify the final state:

ls -la ~/.claude/rules/elle-core.md
ls ~/.claude/.context/core/

Present final report:

Migration Complete!

Path: vX.Y.Z -> ... -> vA.B.C
Backup: ~/.claude/.context-backups/[timestamp]/
Steps executed: N
Steps skipped (already done): M

Your data: 100% preserved. All personal context untouched.

If rules-affecting changes were made (rules/, elle-core.md, context files), suggest running /sync-context.

6. Migration File Format

Each file at references/migrations/vX.Y.Z-to-vA.B.C.md follows this format:

# Migration: vX.Y.Z -> vA.B.C

## Summary
- [1-3 bullet points describing what this migration does]

## Breaking Changes
- [List any breaking changes, or "None"]

## Steps

### 1. [Step name]
**Check:** `[shell command -- if exits 0, skip this step]`
**Action:** `[shell command to execute]`
**Verify:** `[shell command -- must exit 0 to continue]`

Each step MUST have all three fields (Check, Action, Verify). The Check field makes steps idempotent -- safe to re-run on partially completed migrations.

migrate