Phase 3: usage screen

GET /usage serves the numbers behind Claude Code's /usage, read with the
CLI's own stored OAuth credentials (nothing to configure). The endpoint
is undocumented, so parsing is defensive -- the generic limits[] array
becomes labeled window bars, unknown kinds surface under their raw name,
and any failure degrades to an 'unavailable' snapshot with the reason.
One UsageProvider per paid service behind a caching monitor that
enforces the >=180s minimum poll regardless of phone refreshes; no
background polling at all. ureq (rustls) does the outbound call, with
the process-level CryptoProvider now chosen explicitly in main -- ureq
brings ring while axum-server brings aws-lc-rs, and with both in the
graph rustls refuses to guess.

App: a Usage screen off the session list -- per-window bars colored by
utilization with relative reset times. Verified live: 74%/26%/16%
windows rendered against the real endpoint.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017xn8nHw1tw1R6PtiY1eEtw

PLAN.md

@@ -222,9 +222,9 @@ POST /sessions/:id/answer             {question_id, answer}   (questions and per
 POST /sessions/:id/interrupt
 POST /sessions/:id/model              {model}
 POST /sessions/:id/compact            (llama sessions)
+POST /sessions/:id/attachments        multipart upload → id (referenced by /message)
+GET  /sessions/:id/files/:ref         images the session produced or was sent
 DELETE /sessions/:id                  kill process, release llama-server, delete transcript+files
-POST /attachments                     multipart upload → id (referenced by /message)
-GET  /files/:session/:id              images/files the session produced
 GET  /usage                           cached usage windows
 GET/PUT /hosts, /models               config editing from the phone
 ```
@@ -395,9 +395,19 @@ window just fills.
    numbers, delete); the app on the `tdep` emulator against the real
    server (QR-style enrollment via deep link, spawn, streamed echo turn,
    question answer, tool card).
-2. **Claude local** — ClaudeDriver: spawn, stream text/tools, mid-run send,
-   interrupt, permission questions, AskUserQuestion, images both ways, delete.
+2. **Claude local** — *done 2026-08-24.* ClaudeDriver: spawn, stream
+   text/tools, mid-run send, interrupt, permission questions,
+   AskUserQuestion, images both ways, delete.
    *Milestone: daily-drivable Claude replacement on localhost.*
+   Wire-format notes live in `session/claude.rs`'s module doc (pinned
+   against CLI 2.1.237): permissions need the hidden
+   `--permission-prompt-tool stdio` flag; AskUserQuestion answers ride
+   `updatedInput.answers` keyed by question text; `set_model`/`interrupt`
+   are control requests; 2.x permission modes are acceptEdits / auto /
+   bypassPermissions / manual / dontAsk / plan (no more "default").
+   Attachments/files were re-homed under `/sessions/:id/…` (table above)
+   so their lifecycle is the session directory's — delete stays the
+   complete path out.
 3. **Usage screen.**
 4. **llama.cpp** — LlamaServerManager (local), PiDriver, model change,
    compaction controls.