feat: multi-provider sessions — /provider switch, /new --provider, backend tags

[saucam]

What

The Rust TUI's half of multi-provider sessions (daemon side: codeoid #132 pi backend, #133 mid-session switching):

• /provider <id> switches the focused session's backend mid-conversation. Sent as a correlated request so the daemon's fail-closed rejections (unknown provider, mid-turn switch) land in the error line with their real message; the switch announcement itself arrives as a normal info row.
• /new <name> [workdir] --provider <id> creates a session on a specific backend. The flag can lead or trail the positionals, so workdirs with spaces keep working; ids are lowercased; a dangling --provider is a parse error.
• Backend tags in the transcript header for non-default providers — a mixed claude/pi fleet is tellable apart at a glance.
• Protocol crate: SessionCreate.providerId, the session.set_provider verb, SessionInfo.providerId, and AuthOkMsg.providers (default first). All additive with serde defaults, so older daemons keep working.

Tests

Parse coverage for /provider (lowercasing, missing-id error) and /new --provider (flag position independence, dangling flag, no-flag default); wire rename-audit samples for the new verb + create field; roundtrip tests for auth.ok.providers and session.set_provider camelCase serialization. 273 workspace tests green; cargo fmt --check clean.

🤖 Generated with Claude Code

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 7eac0f0 and 515e977.

📒 Files selected for processing (15)

• CHANGELOG.md
• crates/codeoid-client/src/connection.rs
• crates/codeoid-protocol/src/client.rs
• crates/codeoid-protocol/src/daemon.rs
• crates/codeoid-protocol/src/session.rs
• crates/codeoid-protocol/tests/roundtrip.rs
• crates/codeoid-protocol/tests/wire_format.rs
• crates/codeoid-tui/src/app.rs
• crates/codeoid-tui/src/commands/mod.rs
• crates/codeoid-tui/src/state/mod.rs
• crates/codeoid-tui/src/state/sessions.rs
• crates/codeoid-tui/src/ui/approval.rs
• crates/codeoid-tui/src/ui/modal.rs
• crates/codeoid-tui/src/ui/scrollback.rs
• crates/codeoid-tui/src/ui/worker.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/provider-support

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[codecov]

Codecov Report

❌ Patch coverage is 92.01878% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.96%. Comparing base (7eac0f0) to head (515e977).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/codeoid-tui/src/app.rs	85.21%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   67.02%   67.96%   +0.93%     
==========================================
  Files          32       32              
  Lines        7632     7834     +202     
==========================================
+ Hits         5115     5324     +209     
+ Misses       2517     2510       -7     

Flag	Coverage Δ
tui	67.96% <92.01%> (+0.93%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
crates/codeoid-client/src/connection.rs	21.53% <100.00%> (+1.65%)	⬆️
crates/codeoid-protocol/src/client.rs	30.76% <100.00%> (+2.76%)	⬆️
crates/codeoid-protocol/src/session.rs	0.00% <ø> (ø)
crates/codeoid-tui/src/commands/mod.rs	95.65% <100.00%> (+0.91%)	⬆️
crates/codeoid-tui/src/state/mod.rs	84.94% <100.00%> (+0.04%)	⬆️
crates/codeoid-tui/src/state/sessions.rs	98.85% <100.00%> (+<0.01%)	⬆️
crates/codeoid-tui/src/ui/approval.rs	100.00% <100.00%> (ø)
crates/codeoid-tui/src/ui/modal.rs	30.31% <100.00%> (+0.12%)	⬆️
crates/codeoid-tui/src/ui/scrollback.rs	80.30% <100.00%> (+0.92%)	⬆️
crates/codeoid-tui/src/ui/worker.rs	66.32% <100.00%> (+0.23%)	⬆️
... and 1 more