fix(compact): resolve the session's agent; sweep deprecated CLI profiles from all agent stores

[webdevtodayjason]

Live-box bug cluster — HANDOFF item 0 (Jason hit this 2026-06-12 ~12:50 on dev.2)

/compact resolved the wrong agent → "Compaction skipped: No API key"

Two call paths never threaded the session's agent dir into compactEmbeddedPiSession, so it fell back to resolveArgentAgentDir() = <state>/agents/main/agent — and Jason has a real agent literally named main whose store held only the deprecated openai-codex:codex-cli profile:

• gateway commands.compact (the path webchat hits): used resolveDefaultAgentId (ignores the session key entirely) and passed no agentDir. Now resolves via resolveSessionAgentId({sessionKey}) and threads agentDir. This also fixes model resolution + workspace for non-default agents' sessions.
• chat /compact handler: same missing agentDir; now passes resolveAgentDir(cfg, <session agent>).

Bonus: the gateway file's two baseline tsc errors are fixed honestly (resolveAgentWorkspaceDir({cfg, agentId}) was a one-object call to a two-arg function — at runtime it silently resolved the default workspace for every agent; thinkLevel now goes through normalizeThinkLevel). known-failing baseline 191 → 189.

doctor only cleaned the default agent's deprecated CLI profiles

maybeRemoveDeprecatedCliAuthProfiles ran on the main store only — which is why argent's codex-cli profile was cleaned while main's survived. It now sweeps every configured agent's store (deduped by path), lists affected store files in the doctor note, and updates per-agent stores unmerged (updateAuthProfileStoreWithLock grew a raw mode) so main-agent credentials are never copied into other agents' files. Detection reads the raw store file — deliberately avoiding ensureAuthProfileStore's main-merge (false positives) and external-CLI re-sync (import-then-delete churn).

"Context overflow" misclassification — capture side landed

The webchat gpt-5.5 failure (~77k input vs 272k window, zero model activity) was undiagnosable because the chat reply replaces the raw provider rejection with generic overflow text and nothing logged it. Both classification points (prompt-error and assistant-error paths) now log the raw rejection (truncated to 600 chars). The retry discriminator on the live box is still pending — next occurrence will self-document in gateway logs.

Tests / verification

• 2 new gateway cases: agent:argent:main compacts with agents/argent/agent (not agents/main); a session of the agent actually named main still resolves to agents/main.
• 1 new doctor case: sweep cleans the deprecated profile from agents/main/agent without smearing default-agent credentials into it; existing test gained ARGENT_STATE_DIR isolation (the sweep walks the state dir — tests must never touch the real one).
• tsc-since: no net-new errors (189 baseline). Targeted suites green; the one failure in auth-profiles.auth-profile-cooldowns.test.ts reproduces at clean HEAD (pre-existing suite baseline).

Not addressed here (tracked in HANDOFF item 0): operator-lane prompt diet (#407), stale contextTokens on the live session entry (likely self-heals on next successful turn via persistSessionUsageUpdate), split state dirs.

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