fix: replace /gsd: slash command format with /gsd- skill format in all user-facing content (#1579)

* fix: replace /gsd: command format with /gsd- skill format in all suggestions

All next-step suggestions shown to users were still using the old colon
format (/gsd:xxx) which cannot be copy-pasted as skills. Migrated all
occurrences across agents/, commands/, get-shit-done/, docs/, README files,
bin/install.js (hardcoded defaults for claude runtime), and
get-shit-done/bin/lib/*.cjs (generate-claude-md templates and error messages).
Updated tests to assert new hyphen format instead of old colon format.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: migrate remaining /gsd: format to /gsd- in hooks, workflows, and sdk

Addresses remaining user-facing occurrences missed in the initial migration:

- hooks/: fix 4 user-facing messages (pause-work, update, fast, quick)
  and 2 comments in gsd-workflow-guard.js
- get-shit-done/workflows/: fix 21 Skill() literal calls that Claude
  executes directly (installer does not transform workflow content)
- sdk/prompt-sanitizer.ts: update regex to strip /gsd- format in addition
  to legacy /gsd: format; update JSDoc comment
- tests/: update autonomous-ui-steps, prompt-sanitizer to assert new format

Note: commands/gsd/*.md frontmatter (name: gsd:xxx) intentionally unchanged
— installer derives skillName from directory path, not the name field.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(plan-phase): preserve --chain flag in auto-advance sync and handle ui-phase gate in chain mode

Bug 1: step 15 sync-flag check only guarded against --auto, causing
_auto_chain_active to be cleared when plan-phase is invoked without
--auto in ARGUMENTS even though a --chain pipeline was active. Added
--chain to the guard condition, matching discuss-phase behaviour.

Bug 2: UI Design Contract gate (step 5.6) always exited the workflow
when UI-SPEC was missing, breaking the discuss --chain pipeline
silently. When _auto_chain_active is true, the gate now auto-invokes
gsd-ui-phase --auto via Skill() and continues to step 6 without
prompting. Manual invocations retain the existing AskUserQuestion flow.

* fix: remove <sub>/clear</sub> pattern and duplicate old-format command in discuss-phase.md

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

sdk/src/prompt-sanitizer.test.ts

@@ -44,10 +44,27 @@ describe('sanitizePrompt', () => {
     });
   });
 
-  // ─── /gsd: slash commands ────────────────────────────────────────────────
+  // ─── /gsd- skill commands ────────────────────────────────────────────────
 
-  describe('/gsd: slash commands', () => {
-    it('strips lines containing /gsd: commands', () => {
+  describe('/gsd- skill commands', () => {
+    it('strips lines containing /gsd- commands', () => {
+      const input = 'Before\nRun /gsd-execute-plan to proceed\nAfter';
+      const result = sanitizePrompt(input);
+      expect(result).not.toContain('/gsd-');
+      expect(result).toContain('Before');
+      expect(result).toContain('After');
+    });
+
+    it('strips various /gsd- skill formats', () => {
+      const input = [
+        'Use /gsd-research-phase',
+        'Then /gsd-plan-phase --auto',
+        'Finally /gsd-verify-phase',
+      ].join('\n');
+      expect(sanitizePrompt(input)).toBe('');
+    });
+
+    it('strips legacy /gsd: slash commands for backward compatibility', () => {
       const input = 'Before\nRun /gsd:execute-plan to proceed\nAfter';
       const result = sanitizePrompt(input);
       expect(result).not.toContain('/gsd:');
@@ -55,7 +72,7 @@ describe('sanitizePrompt', () => {
       expect(result).toContain('After');
     });
 
-    it('strips various /gsd: command formats', () => {
+    it('strips various legacy /gsd: command formats', () => {
       const input = [
         'Use /gsd:research-phase',
         'Then /gsd:plan-phase --auto',
@@ -190,7 +207,7 @@ describe('sanitizePrompt', () => {
         '',
         'Investigate the codebase using @file:context.md for context.',
         '',
-        'When done, run /gsd:plan-phase to proceed.',
+        'When done, run /gsd-plan-phase to proceed.',
         '',
         'If unclear, AskUserQuestion("What should I focus on?")',
         '',
@@ -205,6 +222,7 @@ describe('sanitizePrompt', () => {
 
       const result = sanitizePrompt(input);
       expect(result).not.toContain('@file:');
+      expect(result).not.toContain('/gsd-');
       expect(result).not.toContain('/gsd:');
       expect(result).not.toContain('AskUserQuestion');
       expect(result).not.toContain('SlashCommand');

sdk/src/prompt-sanitizer.ts

@@ -4,7 +4,7 @@
  *
  * Patterns removed:
  * - @file:... references (file injection directives)
- * - /gsd:... slash commands
+ * - /gsd-... skill commands
  * - AskUserQuestion(...) calls
  * - STOP directives in interactive contexts
  * - SlashCommand() calls
@@ -22,8 +22,8 @@ const LINE_PATTERNS: RegExp[] = [
   // @file:path/to/something references — entire line
   /^.*@file:\S+.*$/gm,
 
-  // /gsd:command references — entire line containing a slash command
-  /^.*\/gsd:\S+.*$/gm,
+  // /gsd-command references — entire line containing a skill command
+  /^.*\/gsd[:-]\S+.*$/gm,
 
   // AskUserQuestion(...) calls — entire line
   /^.*AskUserQuestion\s*\(.*$/gm,