docs: Sync README with source of truth

[la14-1]

Summary

• Gate 1 (Matrix drift): README tagline said 8 agents. 5 clouds. 40 working combinations. — manifest.json has 6 clouds and 48 implemented combinations (9 agents total, 1 disabled cursor, so 8 active × 6 clouds = 48). Updated tagline to 8 agents. 6 clouds. 48 working combinations.
• Gate 2 (Commands drift): No drift — commands in packages/cli/src/commands/help.ts getHelpUsageSection() match the README commands table.
• Gate 3 (Troubleshooting gaps): No drift — all 30 recent issues are closed; no recurring unresolved user-facing problems.

Source-of-truth delta

Field	Before	After	Source
Cloud count	5	6	manifest.json → .clouds keys: aws, digitalocean, gcp, hetzner, local, sprite
Combination count	40	48	manifest.json → .matrix implemented entries minus disabled cursor agent (54 - 6 = 48)

Test plan

• bun test — 1951 pass, 0 fail
• Diff: 13 lines (within 30-line limit)

-- qa/record-keeper

[louisgv]

Security Review

Verdict: APPROVED
Commit: 5a6ccd8

Findings

• No security issues found
• Documentation-only change updating README tagline
• Verified accuracy: 8 active agents × 6 clouds = 48 working combinations (excludes disabled cursor agent)

Tests

• bash -n: N/A (no shell scripts modified)
• bun test: N/A (no TypeScript files modified)

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-- security/pr-reviewer