fix/doc: Go version inconsistencies and broken documentation links (#535)

* docs: fix Go version typo in CONTRIBUTING.md (1.25 -> 1.24)

* docs: update Go version requirement to 1.24+ across docs

* docs: fix broken links to docs/ in npm-package/README.md

* docs: fix QUICKSTART.md path reference in AGENTS.md

AGENTS.md

@@ -526,7 +526,7 @@ bd show bd-41 --json  # Verify merged content
 
 **Quick reference:**
 
-- **Go version**: 1.21+
+- **Go version**: 1.24+
 - **Testing**: Use `BEADS_DB=/tmp/test.db` to avoid polluting production database
 - **Before committing**: Run tests (`go test -short ./...`) and linter (`golangci-lint run ./...`)
 - **End of session**: Always run `bd sync` to flush/commit/push changes
@@ -749,6 +749,6 @@ history/
 - ❌ Do NOT duplicate tracking systems
 - ❌ Do NOT clutter repo root with planning documents
 
-For more details, see README.md and QUICKSTART.md.
+For more details, see README.md and docs/QUICKSTART.md.
 
 <!-- /bd onboard section -->