feat(keyword-detector): add hyperplan keyword pattern, message and test

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/keyword-detector/hyperplan/default.ts

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+/**
+ * Hyperplan keyword detector.
+ *
+ * Triggers when the user wants adversarial multi-agent planning via team-mode.
+ *
+ * Triggers (case-insensitive, word-bounded):
+ * - English: hyperplan, hpp
+ *
+ * The detector injects a thin wrapper that loads the `hyperplan` skill, which
+ * carries the full orchestration instructions for the 5-member adversarial team.
+ */
+
+export const HYPERPLAN_PATTERN = /\b(hyperplan|hpp)\b/i
+
+export const HYPERPLAN_MESSAGE = `<hyperplan-mode>
+**MANDATORY**: Say "HYPERPLAN MODE ENABLED!" as your first response, exactly once.
+
+The user invoked **hyperplan mode** — adversarial multi-agent planning via team-mode.
+
+LOAD THE HYPERPLAN SKILL IMMEDIATELY:
+
+\`\`\`
+skill(name="hyperplan")
+\`\`\`
+
+After loading, follow the skill's 6-phase workflow EXACTLY:
+1. Acknowledge and capture the planning request
+2. Spawn the 5-member adversarial team via team_create
+3. Round 1 — Independent analysis (each member produces findings)
+4. Round 2 — Cross-attack (each member ruthlessly attacks the other 4's findings)
+5. Round 3 — Defend, refine, or concede
+6. Synthesize defensible insights into a work plan + clean up the team
+
+Do NOT improvise. Do NOT skip rounds. Be the lead orchestrator and let the adversarial members do the cross-critique.
+
+If team-mode is unavailable (\`team_*\` tools missing), instruct the user to set \`team_mode.enabled: true\` in \`~/.config/opencode/oh-my-opencode.jsonc\` and restart opencode.
+</hyperplan-mode>`