feat(skills): add api-testing optional skill (#1800)

Adds optional-skills/software-development/api-testing/SKILL.md — a single-file
runbook for systematic REST/GraphQL API debugging via Hermes tools (terminal,
execute_code, web_extract, delegate_task).

- 60-char description; gated to platforms: [linux, macos]
- Layered debug flow (connectivity → TLS → auth → format → parse → semantics)
- HTTP status playbook (401/403/404/409/422/429/5xx)
- Pagination, idempotency, contract validation, correlation IDs
- pytest smoke template, token-redaction patterns, leak checklist
- Hermes tool patterns replace generic curl/python examples

Lands in optional-skills/ (not always-active skills/) so it's installed via
hermes skills install official/software-development/api-testing.

scripts/release.py: AUTHOR_MAP entry for erenkar950@gmail.com → eren-karakus0.

Closes #1800.

Co-authored-by: Teknium <127238744+teknium1@users.noreply.github.com>

scripts/release.py

@@ -62,6 +62,7 @@ AUTHOR_MAP = {
     "HuangYuChuh@users.noreply.github.com": "HuangYuChuh",
     "aaronwong1989@gmail.com": "hrygo",
     "26729613+hrygo@users.noreply.github.com": "hrygo",
+    "erenkar950@gmail.com": "eren-karakus0",
     "aubrey@freeman-wisco.com": "Freeman-Consulting",
     "don.rhm@gmail.com": "rahimsais",
     "40222899+rahimsais@users.noreply.github.com": "rahimsais",