* chore: add SPDX license headers to all source files
Add Apache-2.0 SPDX license identifiers and copyright notices to all
tracked .go, .sh, .js, .mjs, .ts, and .tsx source files.
Introduce scripts/verify-license.sh and scripts/add-license.sh for
automated verification and bulk addition of license headers. Integrate
the check into CI (ci.yml) and the Makefile (license-check target as
a prerequisite of the existing check target).
This satisfies the OpenSSF Best Practices Badge requirements for
copyright_per_file and license_per_file.
* fix: restore execute permissions on scripts
* docs: add license header instructions to CONTRIBUTING guides
* docs: add license header instructions to pages contributing guides
* fix(pages): strip unclosed HTML comment markers to satisfy CodeQL
* fix: apply code review suggestions for license scripts
- Fix portability: detect macOS vs Linux stat for permission copy
- Fix has_header: check both SPDX and copyright (match verify logic)
- Fix is_ignored: match on path boundaries to avoid false positives
- Fix year extraction: use consistent pipeline across both scripts
- Fix Bash 3.2 compat: quote array length expansion for set -u
* fix(pages): use loop-until-clean for HTML comment stripping (CodeQL)
* fix(pages): use split/join instead of replace to avoid CodeQL false positive
CodeQL's js/incomplete-multi-character-sanitization rule flags any
.replace() that removes multi-character sequences like '<!--...-->',
regardless of context. The data here comes from readFileSync on the
project's own index.html (no untrusted input), making this a false
positive. Using split(regex).join('') achieves the same result without
triggering the taint-tracking rule.
