fix: restore context for resumed sessions

[echoVic]

Fixes #28

What changed

• Restore the latest provider context from legacy cumulative session.usage records when bootstrapping a recorded session.
• Derive the context limit from the configured model window instead of hard-coding 128000.
• Publish the restored surface snapshot immediately during history hydration.
• Track typed context revisions so an unchanged surface snapshot cannot overwrite a newer provider context observation.

Root cause

Recorded sessions initialized the runtime surface with 0 / 128000, did not reconstruct legacy usage deltas on resume, and the TUI history path emitted HistoryLoaded without an initial typed surface projection.

Verification

• cargo test -p orca-runtime -p orca-tui --lib -- --test-threads=1: runtime 1008/1009 passed with one existing ACP shutdown timing failure; the failed test passed on three exact reruns.
• cargo test -p orca-tui --lib -- --test-threads=1: 1037 passed, 0 failed.
• cargo test -p orca-runtime resumed_legacy_usage_restores_latest_provider_context --lib: passed.
• cargo test -p orca-tui resumed_legacy_usage_projects_context_before_next_turn --lib: passed.
• cargo test -p orca-tui provider_context_survives_same_revision_surface_sync_in_footer --lib: passed.
• cargo check -p orca-runtime -p orca-tui --all-targets: passed.
• git diff --check: passed.

The real reproduced session has cumulative input totals 929128 and 970611, restoring to 41483 / 1000000, displayed as context 4%.

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[echoVic]

Superseded by merged PR #27 and released in v0.3.7 (6088d85). The same context restoration fix is already on main; closing this duplicate draft PR.

[echoVic]

Closing as superseded by merged PR #27 / v0.3.7.