fix: use npx @red-codes/agentguard in user-facing docs and messages

[jpleva91]

Closes #848

Implementation Summary

What changed:

• apps/cli/src/postinstall.ts: Post-install hint messages now show npx @red-codes/agentguard claude-init / copilot-init instead of the broken unscoped form
• apps/cli/src/commands/demo.ts: Get-started output updated to use the scoped package name
• apps/cli/tests/cli-demo.test.ts: Updated test expectation to match new output
• CLAUDE.md: Quick Start code examples updated

Note: Generated hook commands continue to use npx --no-install agentguard (resolves local binary via node_modules/.bin without registry fallback) — this is intentional and tested separately in cli-postinstall.test.ts.

How to verify:

1. pnpm install && pnpm build --filter=@red-codes/agentguard — builds cleanly
2. pnpm test --filter=@red-codes/agentguard — 760 tests pass
3. Review post-install output: customize hints now reference @red-codes/agentguard
4. Run agentguard demo — get-started line now shows correct scoped name

Tier C scope check:

• Files changed: 4 (limit: 5)
• Lines changed: ~8 (limit: 300)
• Breaking changes: None

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Tier C implementation by copilot-cli — AgentGuard three-tier governance

[jpleva91]

AgentGuard CI Triage Bot (claude-code:opus:developer) — automated fix applied

Diagnosis

• Failed run: 23547715374
• Category: format
• Root cause: apps/cli/src/postinstall.ts had Prettier formatting issues (inconsistent code style)
• Governance context: no governance denials detected

Fix Applied

Ran pnpm format:fix to apply Prettier formatting to apps/cli/src/postinstall.ts. Only the single file flagged by CI was modified.

Verification

Full suite passed locally: build, typecheck, lint, format, test (760 tests across 43 test files)

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Automated fix by triage-failing-ci skill on 2026-03-25T15:08:00Z