feat(codex): deliver architectural decisions into Codex SessionStart

[DresdenGman]

Wire the existing standing-decisions injection into the Codex SessionStart hook so decisions follow the user across agents — matching the behavior that Claude Code already has.

• Extract the MCP-usage paragraph into a module-level _MCP_CONTEXT constant
• On SessionStart, append the relevance-ranked decisions from _session_decision_block() to the context block
• Pass session_id from the hook payload so decision scoring uses it

Closes #786.

[repowise-bot]

✅ Health: 7.6 (unchanged)

📋 At a glance
1 file changed health · 1 hotspot touched · 1 new finding introduced · 1 co-change pair left out. Scoped to packages.

File	Score	Δ	Why
.../augment_cmd/codex.py	10.0 → 9.8	▼ -0.2	🔻 introduced error handling

💡 .../augment_cmd/codex.py: Handle or propagate the error. A swallowed exception, catch-all except, unguarded unwrap, or discarded Go error turns failures into silent misbehavior — log and re-raise, narrow the caught type, replace unwrap with the ? operator or a match, or check the error you are currently discarding.

🔎 More signals (2)

🔥 Hotspot touched (1)

• .../augment_cmd/command.py — 4 commits/90d, 1 dependents · primary owner: Raghav Chamadiya (100%)

🔗 Hidden coupling (1 file)

• .../augment_cmd/command.py co-changes with .../augment_cmd/read_state.py (2× — 🟢 routine) — not in this PR.

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