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/.markdownlint.jsonc

@@ -0,0 +1,20 @@
+// markdownlint configuration — skills/ (M2)
+//
+// Agent-facing SKILL.md files and plan templates contain verbose prose and
+// long shell commands where a strict line-length limit is counterproductive.
+// This file inherits the root config and then overrides the two rules that
+// produce false positives in agent-facing content.
+{
+  // Inherit root-level rules
+  "extends": "../.markdownlint.jsonc",
+
+  // MD013 — line length: disabled for skill files.
+  // Shell commands, long option lists, and URL references commonly exceed 120
+  // chars and wrapping them would break copy-paste usability.
+  "MD013": false,
+
+  // MD024 — duplicate headings: disabled for skill files.
+  // SKILL.md files intentionally use repeated per-agent section headings
+  // (e.g. "### Claude Code", "### Codex") in separate variant sections.
+  "MD024": false
+}