docs(agents): update AGENTS.md to reflect current codebase

[betegon]

Summary

Updates AGENTS.md to accurately document the current state of the codebase. Several sections had outdated information or were missing recently added features.

Changes

• Fixed architecture tree to show actual directory structure (removed misleading sentry-cli/ root)
• Added event/ command domain that was missing
• Expanded lib/ section to document dsn/ and formatters/ subsystems
• Added docs/ folder for the Astro documentation site
• Added ContextError to the error hierarchy
• Added seer.ts to the type organization section
• Added test:unit and test:e2e commands to testing section
• Added documentation location to file locations table

Test plan

• Verified architecture tree matches actual directory structure
• Read through updated AGENTS.md for consistency

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[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Issue

• Add workspace-scoped alias cache by BYK in #52
• Add short ID aliases for multi-project support by BYK in #31

Other

• (api) Align with gh api and curl conventions by BYK in #60
• (auth) Add press 'c' to copy URL during login flow by betegon in #58
• (commands) Rename get commands to view and add -w browser flag by BYK in #53
• Added footer formatting function by MathurAditya724 in #71
• Add explain and plan commands (Seer AI) by MathurAditya724 in #39
• Add Sentry SDK for error tracking and usage telemetry by BYK in #63

Bug Fixes 🐛

Issue

• Support short ID aliases in explain and plan commands by BYK in #74
• Use correct fallback for unrecognized alias-suffix inputs by BYK in #72
• Handle cross-org project slug collisions in alias generation by BYK in #62
• Use org-scoped endpoint for latest event + enhanced display by betegon in #40

Other

• (api) Use query params for --field with GET requests by BYK in #59
• (telemetry) Patch Sentry SDK to prevent 3-second exit delay by BYK in #85

Documentation 📚

• (agents) Update AGENTS.md to reflect current codebase by betegon in #93

• (issue) Update list command tips to reference view instead of get by BYK in #73
• (readme) Add installation section by betegon in #65
• Add documentation website by betegon in #77
• Update command references from 'get' to 'view' and document -w flag by BYK in #54

Internal Changes 🔧

• (issue) Extract shared parameters for issue commands by BYK in #79
• (release) Fix changelog-preview permissions by BYK in #41
• Rename config folder from .sentry-cli-next to .sentry by BYK in #50

Other

• test(e2e): use mock HTTP server instead of live API by BYK in #78

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