chore: remove three unused exports

[oratis]

Closes #15.

What

Three exports with zero callers anywhere in src/:

Removed	From	Notes
createAnthropicClient()	src/llm.ts	Duplicates the work AnthropicProvider already does internally
DEFAULT_MAX_TOKENS	src/llm.ts	Declared but never imported; providers hardcode `16_000` inline
readOnlyToolNames()	src/tools/task.ts	Returns a hardcoded `Set(["read","grep","ls"])`; never called
SessionStore.readAll()	src/sessions/store.ts	Sibling `readMessagePage()` is the one in use (web/server.ts)

Bonus

Dropping SessionStore.readAll removes a JSON.parse(line) path with no try/catch — a single partial JSONL write (e.g. crash mid-append) would have made the whole call throw. The current readMessagePage already wraps each parse in try/catch, so the pattern was inconsistent.

Removing createAnthropicClient makes the Anthropic + proxyAwareFetch imports in src/llm.ts unused. The whole module collapses to one line: export const DEFAULT_MODEL = "claude-sonnet-4-6".

Verification

grep -rn "createAnthropicClient\|DEFAULT_MAX_TOKENS\|readOnlyToolNames\|\.readAll(" src/ --include="*.ts"

After the diff: zero hits outside the test grep itself.

npm run typecheck clean.

Scope

• Three files, −30 lines net
• Pure deletions, no replacement code
• No public API change (these weren't documented or used externally), no behavior change

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