Docs: remove retired Crof from rust/README (stacked on #610)

[Finesssee]

Summary

Stacked on #610 (base codex/integrate-reviewed-ports-20260923). Crof was retired upstream (commit 3404ae3) and #610 already removes the provider from the code and the root and localized READMEs. The only user-facing doc line still listing it on that branch was the provider list in rust/README.md; this removes it. Closes audit GAP-29.

Left alone on purpose: CHANGELOG.md and rust/CHANGELOG.md entries (history), and the retirement fixtures in rust/src/settings/tests.rs. The "40 AI providers" count in rust/README.md was already stale (the root README says 56) and is not changed here.

If #610 is merged first, retarget this PR to main. If #610 is changed to drop rust/README.md itself, this PR becomes empty and can be closed.

Tests

Docs-only; one line changed, original mixed line endings preserved. No code or UI change.

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[Finesssee]

Adversarial validation (Claude Opus 5.5) passed at aa295e1

Scope: GAP-29, Crof retirement in the user-facing docs.

• The PR is one commit on top of the base head codex/integrate-reviewed-ports-20260923 (15f1091).
• It removes "Crof," from the provider list in rust/README.md.

Checks on the change:

• Crof is already retired in code on this base: ProviderId::from_cli_name("crof") == None, the settings migration drops it, and the icon registry test asserts it is gone.
• After this change, the only Crof mentions left in any *.md file are historical entries in CHANGELOG.md and rust/CHANGELOG.md. Those should stay.
• No code, wire, dependency or frontend change.

Checks run at this SHA (toolchain 1.98.0, isolated target dir):

• cargo +1.98.0 fmt --all --check: clean.
• cargo +1.98.0 clippy --workspace --all-targets -- -D warnings: clean.
• cargo +1.98.0 test -p codexbar: 2235 passed, 0 failed, 1 ignored.
• cargo +1.98.0 test -p codexbar-desktop-tauri: 477 passed, 1 failed.
  • The failing test is commands::tests::bootstrap_payload_exposes_every_provider_variant (catalog 78 vs 77).
  • The failure comes from the base and depends on the host. On this base, get_bootstrap_state() calls Settings::load(), because e8aad2a reverted the test-only Settings::default() path. The test therefore reads the local user profile, and one deprecated provider enabled there adds a catalog entry.
  • This PR only edits rust/README.md.

[Finesssee]

Adversarial validation passed at cf151f4

Scope: docs retirement of the Crof provider (#728, GAP-29), validated as merged into release/v0.70.0 (merge cf151f4 = merge of aa295e1 into 3a84269).

Attacks:

• Scope: docs-only change (rust/README.md −1 line, removing Crof from the provider list). Docs were audited against the merged tree: zero remaining "Crof" mentions in rust/README.md and no other user-facing README referencing the retired provider, matching the audit's GAP-29 retirement note.
• Adjacent code risk: none — the change is documentation-only, no production behavior, no test impact, no bridge/locale impact. The browser-use proof is n/a (docs), matching the audit's ui column.
• Locale/bridge check: the audit's Crof retirement tracking (GAP-29) sits with the 0.64.1-eraCrof removal; the merged release branch has no lingering Crof-specific settings or provider paths the README could contradict.

No defects found. READY for the un-draft rule.