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/pi/.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/pi",
+  "files": [
+    {
+      "path": "SKILL.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "8767db25ce6f03e141ce4c48f37e9d7c4958c3cf3d70729f3bd7214b84f6d065"
+    },
+    {
+      "path": "templates/continuation-runbook.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "1685cded3d4abaf03122a490175ff03b7da593ce60cbca97ae15fadcb706617f"
+    },
+    {
+      "path": "templates/milestone-plan.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "364c08bf0a5ee3738195a0770db72c5a4c9ad7f7fb89eaa064eb8c67f47ad69a"
+    },
+    {
+      "path": "templates/story-tracker.md",
+      "kind": "file",
+      "mode": "644",
+      "sha256": "ecb550ea9dcd9dde6c813e90af9f538bf5a247fc249e8e323f2b7bf583e52196"
+    }
+  ]
+}