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

scripts/lib/portable.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# portable.sh — POSIX-safe helper functions for BSD/GNU shell portability
+#
+# Source this file in scripts that need cross-platform variants of:
+#   - stat(1)  — BSD uses -f, GNU uses -c
+#
+# Usage:
+#   source "$(dirname "${BASH_SOURCE[0]}")/portable.sh"
+#   portable_stat_perms "$file"   # -> octal permissions string, e.g. "755"
+#
+# Supported platforms:
+#   - macOS (BSD stat)
+#   - Linux/Ubuntu (GNU stat)
+
+# portable_stat_perms <path>
+# Outputs the file's permission bits as an octal string (e.g. "755").
+# Exits non-zero if stat fails.
+portable_stat_perms() {
+  local path="$1"
+  case "$(uname -s)" in
+    Darwin)
+      stat -f '%Lp' "$path"
+      ;;
+    *)
+      stat -c '%a' "$path"
+      ;;
+  esac
+}