Bump version string to stable v4.x (drop beta)

[lewisgoddard]

Maintenance item for 4.0 Stable. The version string still advertises a beta.

src/phoenix.php:27:

$settings['phoenix_version'] = 'Phoenix Procedural v4.0beta2 2026-05-09 17:23:00Z eustasy';

This is the one explicit "not stable yet" marker in the code, and it is surfaced publicly — the admin panel (src/views/html.admin.php) and the stats views (src/views/json.stats.php, html.stats.php, xml.stats.php, which emit it in $Id: … $ form) all echo $settings['phoenix_version'].

Tasks

• Bump phoenix_version to the stable string (drop beta2) and refresh the timestamp, e.g. Phoenix Procedural v4.0 <date> eustasy.
• Grep for any other beta/4.0beta references and update them (grep -rn beta . --include=*.php).
• Keep the string in sync with the release tag v4.0.0.

Tagging convention

• Going forward the project uses vMAJOR.MINOR.PATCH (v4.x.x) — so 4.0 ships as v4.0.0.
• The most recent prior release has been renamed v.3.2.0 → 3.2.0 (release re-pointed, body preserved). Earlier history (v.3.1, 3.1.5, v.3.0, …) is left as-is — do not retag it.

Acceptance

• No beta remains in the version string or codebase.
• The version shown in the admin panel and stats output reads as stable v4.0 and matches the release tag v4.0.0.

[lewisgoddard]

Re-grepped the tree (grep -rni '4\.0beta') now that the string has moved past beta2. Updated places to flip v4.0beta3 → v4.0.0:

Canonical string — now beta3, not beta2:

• src/phoenix.php:27 — $settings['phoenix_version'] = 'Phoenix Procedural v4.0beta3 …';

Two new spots the issue's --include=*.php grep won't catch (both Markdown, added since this issue was filed):

• README.md:1 — # Phoenix v4.0beta3 (H1 title)
• CHANGELOG.md:3 — ## v4.0beta3 - 04/06/2026 (release heading; per Write 4.0 changelog entry + 3.x→4.0 migration notes #61 this becomes ## v4.0.0 - <date> - <codename> on tag)

Deliberately leave alone — these are not Phoenix's version:

• .github/dependabot.yml:1 and .github/workflows/*.yml:1 — # eustasy/.Normal 4.0beta9 marks the version of the eustasy .Normal shared-config template the file was vendored from (a different project).
• ALTERNATIVES.md:9 — TorrentFlux B4RT … 1.0beta2 is third-party software's version.

The stats/admin views (src/views/html.admin.php, json|html|xml.stats.php) only echo $settings['phoenix_version'], so bumping src/phoenix.php:27 covers them — no literal to change there.

Full "drop beta" set: src/phoenix.php:27, README.md:1, CHANGELOG.md:3.