fix: protected branch detection and non-blocking hooks

- Add protected branch detection to /commit command (Step 1)
- Warn users before committing to protected branches
- Offer to create feature branch automatically
- Rewrite doc-guardian hook to be truly non-blocking
- Enforce strict [plugin-name] prefix in all hook outputs
- Add forbidden words list to prevent accidental blocking

Fixes #109, #110

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

plugins/git-flow/commands/commit.md

@@ -6,13 +6,44 @@ Create a git commit with an auto-generated conventional commit message based on
 
 ## Behavior
 
-### Step 1: Analyze Changes
+### Step 1: Check for Protected Branch
+
+Before any commit operation, check if the current branch is protected:
+
+1. Get current branch: `git branch --show-current`
+2. Check against `GIT_PROTECTED_BRANCHES` (default: `main,master,development,staging,production`)
+
+If on a protected branch, warn the user:
+
+```
+⚠️  You are on a protected branch: development
+
+Protected branches typically have push restrictions that will prevent
+direct commits from being pushed to the remote.
+
+Options:
+1. Create a feature branch and continue (Recommended)
+2. Continue on this branch anyway (may fail on push)
+3. Cancel
+```
+
+**If option 1 (create feature branch):**
+- Prompt for branch type (feat/fix/chore/docs/refactor)
+- Prompt for brief description
+- Create branch using `/branch-start` naming conventions
+- Continue with commit on the new branch
+
+**If option 2 (continue anyway):**
+- Proceed with commit (user accepts risk of push rejection)
+- Display reminder: "Remember: push may be rejected by remote protection rules"
+
+### Step 2: Analyze Changes
 
 1. Run `git status` to see staged and unstaged changes
 2. Run `git diff --staged` to examine staged changes
 3. If nothing staged, prompt user to stage changes
 
-### Step 2: Generate Commit Message
+### Step 3: Generate Commit Message
 
 Analyze the changes and generate a conventional commit message:
 
@@ -38,7 +69,7 @@ Analyze the changes and generate a conventional commit message:
 
 **Scope:** Determined from changed files (e.g., `auth`, `api`, `ui`)
 
-### Step 3: Confirm or Edit
+### Step 4: Confirm or Edit
 
 Present the generated message:
 
@@ -58,7 +89,7 @@ Options:
 4. Cancel
 ```
 
-### Step 4: Execute Commit
+### Step 5: Execute Commit
 
 If confirmed, run:
 
@@ -75,6 +106,7 @@ EOF
 
 | Variable | Default | Description |
 |----------|---------|-------------|
+| `GIT_PROTECTED_BRANCHES` | `main,master,development,staging,production` | Branches that trigger protection warning |
 | `GIT_COMMIT_STYLE` | `conventional` | Message style (conventional, simple, detailed) |
 | `GIT_SIGN_COMMITS` | `false` | Use GPG signing |
 | `GIT_CO_AUTHOR` | `true` | Include Claude co-author footer |