Add audience grants for agent access

[chubes4]

Summary

• Adds Data Machine storage and CLI/ability surfaces for non-user agent access grants such as audience:public.
• Adapts the Agents API access store to the principal-aware contract from Add audience principals for agent access Automattic/agents-api#173.
• Allows public audience chats to run under the selected agent owner's safe runtime context after access is granted.

Testing

• php tests/agents-api-access-store-adapter-smoke.php
• homeboy lint data-machine --path /Users/chubes/Developer/data-machine@fix-audience-agent-grants --changed-since origin/main
• php -l inc/Core/Auth/AgentAccessStoreAdapter.php
• php -l inc/Core/Database/Agents/AgentAccess.php
• php -l inc/Abilities/Chat/AgentsChatHandler.php
• php -l inc/Abilities/AgentAbilities.php

Depends on

• Add audience principals for agent access Automattic/agents-api#173 (merged)

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Implemented and tested the Data Machine audience-grant path under Chris's direction.

[homeboy-ci]

Homeboy Results — data-machine

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine --changed-since 959b18b

Test

✅ test — passed

• 900 passed
• 3 skipped

ℹ️ Auto-fix lint issues: homeboy refactor data-machine --from lint --write
ℹ️ Collect coverage: homeboy test data-machine --coverage
ℹ️ Save test baseline: homeboy test data-machine --baseline
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine --changed-since 959b18b

Audit

✅ audit — passed

• requested_detectors — 127 finding(s)
• test_coverage — 43 finding(s)
• dead_code — 9 finding(s)
• intra-method-duplication — 8 finding(s)
• dead_guard — 2 finding(s)
• repeated_literal_shape — 2 finding(s)
• Auth — 1 finding(s)
• Directives — 1 finding(s)
• Retention — 1 finding(s)
• structural — 1 finding(s)
• Total: 195 finding(s)

Deep dive: homeboy audit data-machine --changed-since 959b18b

Tooling versions

• Homeboy CLI: homeboy 0.181.6+42e65aea
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: a4a13b7
• Action: unknown@unknown