fix(hooks): remove all venv auto-repair code that deleted .venv directories

BREAKING: Removes automatic venv management that was causing session failures

Changes:
- Delete scripts/venv-repair.sh (was deleting and recreating venvs)
- Remove auto-repair code from projman/hooks/startup-check.sh
- Remove venv-repair call from scripts/post-update.sh
- Remove rm -rf .venv instructions from docs/UPDATING.md and CONFIGURATION.md
- Update docs/CANONICAL-PATHS.md to remove venv-repair.sh reference

Additionally:
- Add Pre-Change Protocol to CLAUDE.md (mandatory dependency check before edits)
- Add Pre-Change Protocol enforcement to claude-config-maintainer plugin
- Add Development Context section to CLAUDE.md clarifying which plugins are
  used in this project vs only being developed
- Reorganize commands table to separate relevant vs non-relevant commands

The venv auto-repair was the root cause of repeated MCP server failures,
requiring manual setup.sh runs after every session start.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/CANONICAL-PATHS.md

@@ -163,12 +163,11 @@ leo-claude-mktplace/
 │       └── claude-md-integration.md
 ├── scripts/                    # Setup and maintenance scripts
 │   ├── setup.sh                # Initial setup (create venvs, config templates)
-│   ├── post-update.sh          # Post-update (rebuild venvs, verify symlinks)
-│   ├── check-venv.sh           # Check if venvs exist (for hooks)
+│   ├── post-update.sh          # Post-update (clear cache, show changelog)
+│   ├── check-venv.sh           # Check if venvs exist (read-only)
 │   ├── validate-marketplace.sh # Marketplace compliance validation
 │   ├── verify-hooks.sh         # Verify all hooks use correct event types
-│   ├── setup-venvs.sh          # Setup/repair MCP server venvs
-│   ├── venv-repair.sh          # Repair broken venv symlinks
+│   ├── setup-venvs.sh          # Setup MCP server venvs (create only, never delete)
 │   └── release.sh              # Release automation with version bumping
 ├── CLAUDE.md
 ├── README.md