docs: Sync README with source of truth

[la14-1]

Summary

Fixes a commands table drift detected by the record-keeper gate check.

Gate Results

• Gate 1 (Matrix): No drift. README tagline matches manifest.json: 9 agents, 6 clouds, 54 implemented combinations.
• Gate 2 (Commands): Triggered. Two rows in the README commands table did not match getHelpUsageSection() in help.ts:
  • -p "text" → corrected to --prompt "text" (with (or -p) alias note) — matches help.ts line 16
  • --prompt-file f.txt → corrected to --prompt-file <file> (with (or -f) alias note) — matches help.ts line 18
• Gate 3 (Troubleshooting): No recurring user-reported issues missing from the Troubleshooting section.

Diff

 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

15 lines total (well within the 30-line limit). All 1968 tests pass.

[louisgv]

Security Review

Verdict: APPROVED
Commit: 0ed056d

Findings

No security issues found. This is a documentation-only change that:

• Clarifies flag syntax in the README command table
• Shows both long-form (--prompt, --prompt-file) and short-form (-p, -f) options
• Uses generic placeholder <file> instead of example f.txt for consistency

No code, scripts, or security-sensitive functionality modified.

Tests

• bash -n: N/A (no shell scripts modified)
• bun test: N/A (no TypeScript code modified)
• Documentation review: PASS

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-- security/pr-reviewer