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>

plugins/projman/hooks/startup-check.sh

@@ -7,29 +7,6 @@ PREFIX="[projman]"
 
 # Calculate paths
 PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "$(realpath "$0")")")}"
-# Marketplace root is 2 levels up from plugin root (plugins/projman -> .)
-MARKETPLACE_ROOT="$(dirname "$(dirname "$PLUGIN_ROOT")")"
-VENV_REPAIR_SCRIPT="$MARKETPLACE_ROOT/scripts/venv-repair.sh"
-
-# ============================================================================
-# Auto-repair MCP venvs (runs before other checks)
-# ============================================================================
-
-if [[ -x "$VENV_REPAIR_SCRIPT" ]]; then
-    # Run venv repair - this creates symlinks to cached venvs
-    # Only outputs messages if something needed fixing
-    "$VENV_REPAIR_SCRIPT" 2>/dev/null || {
-        echo "$PREFIX MCP venv setup failed - run: cd $MARKETPLACE_ROOT && ./scripts/setup-venvs.sh"
-        exit 0
-    }
-else
-    # Fallback: just check if venv exists
-    VENV_PATH="$PLUGIN_ROOT/mcp-servers/gitea/.venv/bin/python"
-    if [[ ! -f "$VENV_PATH" ]]; then
-        echo "$PREFIX MCP venvs missing - run setup.sh from installed marketplace"
-        exit 0
-    fi
-fi
 
 # Check git remote vs .env config (only if .env exists)
 if [[ -f ".env" ]]; then