feat: consolidate SiteContext into SITE.md with auto-refresh

[chubes4]

Summary

• Eliminates duplicate site context injection — AI calls were getting site info twice (SITE.md at priority 20 + SiteContextDirective JSON at priority 80). Now it's just SITE.md.
• Enriches SITE.md with all the data SiteContext provided: post counts, taxonomy term counts, hierarchy, associations, language, timezone, permalinks — all as markdown tables.
• Auto-refreshes SITE.md on disk when site structure changes (hooks: save_post, switch_theme, activated_plugin, etc.) with 60-second debounce.

Before → After

BEFORE (every AI call):
├── Priority 20: SITE.md (static, 22 lines, never refreshed)
└── Priority 80: SiteContextDirective JSON (live, auto-refreshed)
    ← DUPLICATE

AFTER (every AI call):
└── Priority 20: SITE.md (live, auto-refreshed, enriched with counts/details)
    ← SINGLE SOURCE OF TRUTH

Changes across 5 files

File	What changed
migrations.php	Enriched datamachine_get_site_scaffold_content() with post/taxonomy tables, language, timezone, permalinks. Added datamachine_regenerate_site_md() with debounce + custom content preservation. Added datamachine_register_site_md_invalidation() hook registration.
bootstrap.php	Replaced SiteContext cache invalidation + SiteContextDirective include with datamachine_register_site_md_invalidation()
SiteContext.php	Deprecated to no-op (class kept for backward compat)
SiteContextDirective.php	Deprecated to no-op (class kept, not registered in directive chain)
data-machine.php	Calls datamachine_regenerate_site_md() on activation + cleans up legacy transient

Sample enriched SITE.md output

# SITE

## Identity
- **name:** chubes.net
- **url:** https://chubes.net
- **theme:** Chubes
- **language:** en_US
- **timezone:** America/Chicago
- **permalinks:** /%postname%/
- **multisite:** false

## Post Types
| Label | Slug | Published | Type |
|-------|------|-----------|------|
| Posts | post | 42 | flat |
| Pages | page | 12 | hierarchical |
| Documentation | documentation | 28 | hierarchical |

## Taxonomies
| Label | Slug | Terms | Type | Post Types |
|-------|------|-------|------|------------|
| Categories | category | 8 | hierarchical | post |
| Tags | post_tag | 24 | flat | post |
| Projects | project | 5 | hierarchical | documentation |

## Active Plugins
- FluentSMTP
- DocSync
- Yoast SEO

Testing

• All 5 files pass php -l syntax check
• PHPUnit: 906 tests, same pass/fail as main (5 errors, 24 failures — all pre-existing)
• site_context_enabled setting repurposed to control SITE.md auto-refresh
• User-added content below <!-- CUSTOM --> marker is preserved across regenerations

Backward Compatibility

• SiteContext class and SiteContextDirective class are deprecated, not deleted
• Both return empty/no-op to avoid fatal errors in third-party code
• datamachine_site_context and datamachine_site_context_directive filters no longer fire (no known consumers)
• Will be fully removed in a future major version

Closes #871. Related: #872 (additional enrichment beyond SiteContext data).

[github-actions]

Homeboy Results — data-machine

Lint

Failure Digest

Lint Failure Digest

• No structured lint details available.
• Full lint log: https://github.com/Extra-Chill/data-machine/actions/runs/23277626084

Autofixability classification

• Overall: human_needed
• Autofix enabled: no
• Autofix attempted this run: no
• Human-needed failed commands:
  • lint
• Failed commands with available automated fixes:
  • lint
• Automated fixes are disabled for this step. Commands with available fix support in this run: lint

Machine-readable artifacts

• homeboy-lint-summary.json
• homeboy-test-failures.json
• homeboy-audit-summary.json
• homeboy-autofixability.json

⚡ Scope: changed files only

❌ lint (changed files only)

Test

Failure Digest

Test Failure Digest

• Failed tests: 8
• No structured test failure details available.
• Full test log: https://github.com/Extra-Chill/data-machine/actions/runs/23277626084

Autofixability classification

• Overall: human_needed
• Autofix enabled: no
• Autofix attempted this run: no
• Human-needed failed commands:
  • test
• Failed commands with available automated fixes:
  • test
• Automated fixes are disabled for this step. Commands with available fix support in this run: test

Machine-readable artifacts

• homeboy-lint-summary.json
• homeboy-test-failures.json
• homeboy-audit-summary.json
• homeboy-autofixability.json

⚡ Scope: changed files only

❌ test (changed files only)

Audit

⚡ Scope: changed files only

✅ audit (changed files only)

Tooling versions

• Homeboy CLI: homeboy 0.81.1+b2a8c69b
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: unknown
• Action: Extra-Chill/homeboy-action@v1

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Homeboy Action v1