fix: accept the short provider alias in session clear

[cdayAI]

Problem

maverick session import takes a short provider name (e.g. chatgpt) but stores the blob under the canonical name chatgpt-session. maverick session clear passed its argument through verbatim to cookie_store.clear_session, so the natural follow-up failed:

$ maverick session import chatgpt --token ...
Saved session to .../chatgpt-session.json (chmod 600)
$ maverick session clear chatgpt
No session stored for chatgpt        # exit 1 — but it IS stored

The user had to run session list, notice the -session suffix, and retype session clear chatgpt-session. import and clear accepted different vocabularies for the same thing.

Fix

session clear now canonicalizes through the same _SESSION_IMPORT_PROFILES alias map that import uses, so clear chatgpt resolves to chatgpt-session. The canonical name still works, and unknown free-form names still pass through unchanged (the cookie store is generic — users may have stored sessions under arbitrary names).

Tests

tests/test_session_clear_alias.py:

• clear chatgpt succeeds right after import chatgpt (the regression)
• clear chatgpt-session (canonical) still works
• an unknown name still reports missing + exit 1

Full suite green (2909 passed), ruff clean.

https://claude.ai/code/session_01KUbbAGDTacAKWJdYHnCzfa

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