chore(release): bump version to 1.20.0

[ErickXavier]

Summary

• Bump package.json version from 1.19.0 to 1.20.0
• Rebuild dist/ output with updated version banner

Evidence

• Build: npm run build succeeded — all 3 formats (IIFE, ESM, CJS) output
• Tests: 20 suites, 498 passed, 5 skipped, 0 failed

Status

HELD — do not merge until v1.20.0 release (T10)

[ErickXavier]

APPROVED — QA GATE (T8, EPIC NOJS-270)

Scope verified: version bump 1.19.0 → 1.20.0 only. HELD note present in PR body (do not merge until v1.20.0 release, T10).

Evidence

• package.json:3 at 1.20.0; only other changes are the version banner line in dist/cjs, dist/esm, dist/iife — no stray changes.
• Fresh rebuild (npm run build, all 3 formats) → git status clean on dist/, committed output byte-identical.
• npm test (with Core sibling checkout present, as the suite requires): 20 suites passed, 498 passed / 5 skipped — matches PR body exactly.
• Code review (multi-angle): no correctness findings; banner is generated from pkg.version in build.js, no hardcoded versions in src/tests, README badge is dynamic.
• Commit 5cac90b conventional, author/committer Erick Xavier, no trailers, no AI attribution in commit or PR body.
• Ecosystem parity confirmed: nojs#290, nojs-lsp#81, nojs-skill#70 all at 1.20.0.

Non-blocking notes

• CHANGELOG has no [1.20.0] entry — expected, deferred to T9.
• package-lock.json root version stale at 1.16.1 (pre-existing; LSP's PR bumped its lock — consider aligning here in T9/release).

[ErickXavier]

Appended changelog commit (0390176): docs(changelog): add v1.20.0 entry + aligned package-lock.json root version to 1.20.0.

[ErickXavier]

APPROVED — QA GATE (T9 / NOJS-279)

Verified:

• CHANGELOG [1.20.0] entry matches the house style of the [1.19.0]/[1.18.0]/[1.17.0] compatibility entries verbatim (heading ## [1.20.0](compare) — 2026-07-17, ### Changed, single alignment bullet); [Unreleased] link advanced to v1.20.0...HEAD.
• "No functional changes to elements" claim verified: the two commits touch only CHANGELOG.md, package.json, package-lock.json, and the three dist banners (exactly 1 line each, v1.19.0 → v1.20.0, consistent with a clean rebuild of unchanged src — banner derives from pkg.version in build.js).
• package-lock.json diff limited to the two root version fields (1.16.1 → 1.20.0); this also fixes pre-existing lock drift (the 1.19.0 release never updated the lockfile).
• Both commits conventional (chore/docs scopes), authored by Erick Xavier, no AI attribution trailers.
• /code-review pipeline (8 finder angles across 3 batches): zero findings.

No blocking issues. Ready to merge at T10.