feat: add native Ponytail support for Amp

[o-az]

Summary

• add a dependency-free Amp plugin that injects Ponytail's canonical, mode-filtered guidance on every agent turn
• keep off, lite, full, and ultra modes isolated per thread, with prompt-command and exact deactivation handling
• add native command-palette controls for thread mode, status, default mode, and upstream documentation
• persist the default in Amp's global plugin configuration, honor PONYTAIL_DEFAULT_MODE, and react to live configuration changes
• document GitHub installation/update steps and include Ponytail's full MIT notice

Validation

• bun test tests/ponytail-plugin.test.ts (9 passing)
• node node_modules/oxlint/dist/cli.js --deny-warnings plugins/ponytail.ts tests/ponytail-plugin.test.ts
• node node_modules/oxfmt/dist/cli.js --check plugins/ponytail.ts tests/ponytail-plugin.test.ts plugins/README.md .github/README.md
• bun build plugins/ponytail.ts --outdir /tmp/amp-ponytail-build
• installed the pushed branch from its raw GitHub URL into a clean temporary workspace; amp plugins list reported the plugin active with both events and all four commands
• exercised the installed source with amp plugins exec

mise ci was not available in the orb because mise is not installed; the touched-file checks above cover the plugin-specific formatter, linter, tests, bundle, install, and runtime paths.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​ampcode/​plugin@​0.0.0-20260805002929-g5b1c43a

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