Update id774.net header URL to HTTPS

[id774]

Summary

• Mechanically changed More info: http://id774.net to More info: https://id774.net in file headers (89 files).
• No changes other than the URL scheme (http → https).
• No version changes.
• No changes to Version History, README, or other documentation (the example text inside doc/POLICY.md was intentionally left out of scope).
• No test additions or changes (spec files only had their own header line updated).

Mandatory Validation (actual results)

• Old notation remaining: PASS (except for 1 example occurrence in doc/POLICY.md, which is intentionally out of scope and left unchanged)
• Diffs other than URL scheme: 0 — PASS
• Out-of-scope changes: 0 — PASS
• Version changes: 0 — PASS
• Version History changes: 0 — PASS
• Other documentation changes: 0 — PASS
• Test changes: 0 — PASS
• Dependency changes: 0 — PASS
• git diff --check: PASS (0 whitespace errors)

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