Add complete Chainhooks guide section faithfully migrated from Hiro docs

[huth-stacks]

Summary

• Migrates 13 files covering the complete Chainhooks developer guide from Hiro docs
• All content faithfully preserved from Hiro source - no truncation, no rewording
• Addresses every content issue identified in the PR Migrate curated Hiro docs into Stacks docs #1847 review

Files Added (13)

Guide Pages

• docs/build/chainhooks/overview.md - Product overview with v1/v2 context, three management approaches
• docs/build/chainhooks/quickstart.md - SDK introduction with TypeScript types section restored
• docs/build/chainhooks/create.md - Registration with "(maximum 200)" UUID limit restored
• docs/build/chainhooks/fetch.md - Paginated listing and single fetch
• docs/build/chainhooks/update.md - Updates with anti-pattern example restored
• docs/build/chainhooks/evaluate.md - Block replay by height or hash
• docs/build/chainhooks/secrets.md - Secret rotation with server.listen() restored
• docs/build/chainhooks/migration.md - v1→v2 migration with accurate mapping table
• docs/build/chainhooks/faq.md - All 11 FAQ questions restored (was 6)

Reference Pages

• docs/build/chainhooks/reference/README.md - Reference landing
• docs/build/chainhooks/reference/filters.md - 373 lines with all 31 code examples (was 170 lines)
• docs/build/chainhooks/reference/options.md - Per-option subsections with individual code examples
• docs/build/chainhooks/reference/payload-anatomy.md - Complete JSON with all metadata fields

Files Modified (2)

• docs/build/SUMMARY.md - Added Chainhooks section navigation
• docs/build/get-started/clarity-crash-course.md - Updated Chainhooks link to local path

Reviewer Feedback Addressed (ALL items from the reviewer)

Issue	Fix
Naming inconsistency	Enforced: "Chainhooks" (product), "Chainhooks SDK" (npm), "Chainhooks API" (REST)
Missing v1/v2 context in overview	Restored
Missing TypeScript types in quickstart	Restored (ChainhookDefinitionSchema, ChainhookStatusSchema, etc.)
Missing "(maximum 200)" UUID limit	Restored in create.md
Missing anti-pattern example in update	Restored ("Bad: Will overwrite any existing events")
Missing server.listen() in secrets	Restored in Fastify example
MEANING CHANGE in migration table	Fixed: "v2 handles secrets automatically" (was "Delivery target stays the same")
Missing rotateConsumerSecret() note	Restored
Missing "Extras" column in migration	Restored
5 missing FAQ questions	All 11 restored including beta pricing, "Can I test locally?"
Missing "Where to Get Help"	Restored (Discord + email)
9+ missing code examples in filters	All 31 examples present (ft_mint, ft_burn, nft variants, contract_call/log variants, tenure_change extended)
Per-option docs collapsed to table	Restored per-option subsections with individual code examples
JSON examples gutted in payload-anatomy	Complete JSON with realistic data and all metadata fields

Context

PR 3 of 7 decomposing the Hiro docs migration (#1847). This was the most heavily criticized section.

Test plan

• Verify filters.md has all 31 code examples (was 170 lines → now 373)
• Verify faq.md has all 11 questions (was 6)
• Verify migration.md row 3 says "v2 handles secrets automatically"
• Verify quickstart.md has TypeScript types section
• Verify update.md has anti-pattern example
• Verify naming consistency across all 13 files
• Run markdown link checker

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