Post-merge cleanup: whitespace, doc sync, canonical skill names, root CLAUDE.md (#33)

Cleanup pass following the CoCounsel merge (#4) and Lexis removal (#5):
- Normalize whitespace and JSON indentation across plugin metadata files
- Sync marketplace.json with plugin.json (ip-legal description, Courtroom5 title field)
- Add missing ai-inventory and invention-intake rows to README skill reference
- Replace stale short-form skill names in customize/cold-start SKILL.md prose with canonical directory names across 11 plugins (same bug class as the /setup -> /cold-start-interview QA fix)
- Fix FYY -> FYI typo and a phantom WebFetch claim in launch-radar docs
- Address review findings: line-wrapped /check-claims, /renewals-due -> /renewal-tracker, stale /setup in references/, agent.yaml comment contradiction, redundant 'intake intake'
- Add root CLAUDE.md with validation conventions (claude plugin validate, I1-I11 invariants, frontmatter requirements) and a marketplace.json description + $schema

No behavioral changes. claude plugin validate passes clean.

references/company-profile-template.md

@@ -1,7 +1,7 @@
 # Company Profile
 
 *Shared by all Claude for Legal plugins. The first plugin you set up writes this; the rest read it.
-Edit directly or re-run any plugin's `/setup` to update.*
+Edit directly or re-run any plugin's `/cold-start-interview` to update.*
 
 **Practice setting:** [Solo/small firm | Midsize/large firm | In-house | Government/legal aid/clinic]
 **Name:** [Company or firm name]