feat(tui): interactive config screen with identity and model memory

[duyet]

Summary

• Settings screen in the TUI: config (and the launcher) now opens a grouped, navigable settings screen — sections for Account, Model, and Defaults with current values right-aligned and tone-colored, ↑↓/jk to move, ↵ to edit, x to reset, non-TTY falls back to the existing status output / dump mode.
• Account identity: new MeInfo + fetch_me (GET /v1/me) shows username · email on the account line; the account entry opens the picker to switch accounts or re-auth.
• Model entry: focusable to pick from /v1/models, saved to the profile's default_model.
• Remember launched model: anyr claude --model X persists X as the session default, so a bare anyr claude next time starts with it. First launch on a fresh machine seeds a profile instead of silently skipping persistence.
• Hermetic tests: launch dry-run tests now run against a temp ANYROUTER_HOME; they previously read the developer's real config and passed only by coincidence.

Test plan

• cargo test — 108 lib + 45 cli + 7 release-lock pass
• cargo clippy --all-targets — no new warnings (baseline 5 pre-existing)
• cargo fmt --check — changed files clean (pre-existing diffs untouched)
• New integration test: launch with --model, relaunch dry-run asserts remembered model, config records it

🤖 Generated with Claude Code

[github-actions]

anyr size and startup

Startup is wall time for a cold anyr --version / anyr --help (median of 21 runs). Size is the stripped release binary, or the .wasm for the browser demo.

Size budget: anyr-linux-x86_64 must stay ≤ 4.0 MiB (4194304 bytes) stripped.

Asset	Kind	Size	--version median	--help median
anyr-darwin-arm64	native	2.3 MiB	3.26 ms	3.51 ms
anyr-linux-arm64	native	2.3 MiB	0.7 ms	0.69 ms
anyr-linux-x86_64	native	2.5 MiB	0.58 ms	0.59 ms
anyr-windows-x86_64.exe	native	2.1 MiB	8.7 ms	8.63 ms
anyr.wasm	wasm	170.6 KiB	—	—

Budget check: ok

raw timings

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    "size": "2.3 MiB",
    "version": "0.1.10 (built 2026-08-22 22:11:05)",
    "target": "aarch64-apple-darwin",
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    "size": "2.1 MiB",
    "version": "0.1.10 (built 2026-08-22T22:12:01Z)",
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    "asset": "anyr.wasm",
    "kind": "wasm",
    "path": "/home/runner/work/cli/cli/target/wasm-pkg/anyr_cli_bg.wasm",
    "bytes": 174670,
    "size": "170.6 KiB",
    "version": "wasm",
    "target": "wasm32-unknown-unknown",
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