Perform code optimization and document cleanup (#1)

## Summary
- add repository-wide quality tooling and verification scaffolding, including CI workflows, pnpm workspace setup, ESLint/Prettier/markdown checks, and generated-output verification helpers
- reorganize skill sources and generation flow by introducing canonical `_source` variants, generator/manifests, reusable helper abstractions, and shared web-automation/browser utilities
- clean up and expand documentation so the root README flows into docs and skill docs, with clearer development, reviewer, installer, and workflow guidance

## Notable changes
- docs flow and consistency cleanup across `README.md`, `docs/README.md`, and related docs
- new scripts for `check`, docs verification, generated-file verification, shell portability, and safe directory replacement
- refactors in Atlassian and web-automation skill runtimes to reduce duplication and centralize reusable code
- changelog, development documentation, and CI surface updates

## Test Plan
- [ ] `pnpm run check`
- [ ] review generated/manifests and skill sync outputs
- [ ] smoke-check docs flow from `README.md` to `docs/README.md` to skill docs

## Notes
- this branch currently includes tracked `skills/web-automation/shared/node_modules` content that should be reviewed carefully as potentially noisy/accidental committed artifacts

Co-authored-by: Stefano Fiorini <stefano.fiorini@firsthorizon.com>
Reviewed-on: #1

skills/create-plan/opencode/.generated-manifest.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "https://ai-coding-skills.dev/schemas/generated-manifest/v1.json",
+  "generator": "scripts/generate-skills.mjs",
+  "generatedRoot": "skills/create-plan/opencode",
+  "files": [
+    {
+      "path": "SKILL.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "881c5fb4bb1c75535018d8eb1d557ac6779da8267607d2cb5ae52481bf961b77"
+    },
+    {
+      "path": "templates/continuation-runbook.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "15efb6e1fcfbdcc9c0d5fa1b357dea600afe42a20b761863bece6792f53dbd84"
+    },
+    {
+      "path": "templates/milestone-plan.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "36231230edd506e22a42d82293adefff6b5434fe972fde6767ca0b7ddf6b5dd3"
+    },
+    {
+      "path": "templates/story-tracker.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "2756a718f5de9709347085f6e0a525ec8c0e52dc3b9f67ddc4c226b60df1c967"
+    }
+  ]
+}