fix(kyberforge): improve skill-author based on spec validation and audit

- Add name field format constraints (1-64 chars, hyphens rules)
- Add output format template pattern to ## Patterns
- Add scope design note before prerequisites checklist
- Add reference depth rule (one level deep)
- Restore Placement table to README
- Trim script rules to 2 inline + full contract in references/scripts.md
- Add script contract section to references/scripts.md (error messages,
  dry-run/confirm pairing, output size, idempotency, exit codes)
- Update Step 5 headings to "Validate and close" in both flows
- Remove "Performs best when preceded by grill session" from description
- Condense Include/Exclude block to single forwarding sentence
- Fix README Files table: add README.md row, update scripts.md description

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016z2ZFYHQCex8yZAMVMTZzZ

plugins/kyberforge/skills/skill-author/references/scripts.md

@@ -63,6 +63,17 @@ end
 ruby scripts/extract.rb
 ```
 
+## Script contract
+
+Rules for all agentic scripts:
+
+- **Self-contained** — bundle dependencies inline so the agent can run the script with a single command; do not require a separate install step
+- **Structured output** — data (JSON, CSV) to stdout; diagnostics and progress to stderr
+- **Idempotent** — "create if not exists"; agents may retry on failure
+- **Meaningful exit codes** — `0` success, non-zero failure; document in `--help`
+- **Dry-run support** — add `--dry-run` for destructive operations; pair with `--confirm`/`--force` for operations that can't be undone
+- **Error messages** — on failure, state what went wrong, what was expected, and what to try; vague errors leave agents unable to self-correct
+
 ## Output size
 
 Many harnesses truncate tool output beyond 10–30K characters. Default to a summary or a reasonable output limit. For scripts that can produce large output: support `--offset N` for pagination, or use `--output FILE` to write to disk and keep stdout clean.