chore: sync upstream pingdotgg/t3code

[wizzoapp]

Nightly upstream sync of pingdotgg/t3code → fork main.

Synced commits (cherry-picked c0bb237..62cf461)

• 23c18fd fix(web): keep composer editable while disconnected (fix(web): keep composer editable while disconnected pingdotgg/t3code#4241)
• 62cf461 fix: better defaults — Claude 1M context, Codex gpt-5.6, worktrees from origin main (fix: better defaults — Claude 1M context, Codex gpt-5.6, worktrees from origin main pingdotgg/t3code#4240)

Conflict resolution

The only files where our resolution could introduce a bug (everything else applied cleanly):

• apps/web/src/components/chat/ChatComposer.tsx — the disabled prop line was already identical on both sides (fork had removed environmentUnavailable earlier with an explanatory comment; upstream fix(web): keep composer editable while disconnected pingdotgg/t3code#4241 does the full change). Kept upstream's behaviour plus the fork's local comment documenting the queue-while-disconnected rationale.
• apps/server/src/vcs/GitVcsDriverCore.ts — the fork uses its remoteRefEntries structure for remote-branch listing; grafted upstream fix: better defaults — Claude 1M context, Codex gpt-5.6, worktrees from origin main pingdotgg/t3code#4240's origin/<default> → isDefault computation onto that structure (defaultBranch !== null && parsedRemoteRef?.remoteName === "origin" && parsedRemoteRef.branchName === defaultBranch). Upstream's combined-branches re-sort hunk applied cleanly.
• apps/server/src/vcs/GitVcsDriverCore.test.ts — kept the fork's superset of tests (broken remote-tracking ref, missing local ref target) AND added upstream's new test ("marks the origin default ref as default when no local copy exists").

Verification (all green)

• vp run typecheck ✓
• vp check ✓ (0 errors)
• vp test run ✓ — 703 test files passed, 6547 tests passed / 22 skipped

Gated by CI + the upstream-sync procedure (no panel autoreview on sync PRs).

[wizzoapp]

@codex review

[chatgpt-codex-connector]

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[adamfgr]

Auto-approved by wizzo-approve: all policy conditions verified against HEAD 2df8d04.