chore: add missing model exports

[aaryan610]

Description

This PR includes the following changes-

1. Added missing exports for some models, including- Label, Epic and more.
2. Rearranged the exports alphabetically for better maintainability.

Type of Change

• Improvement (change that would cause existing functionality to not work as expected)

Summary by CodeRabbit

• Chores
  • Reorganized and consolidated public module exports to streamline the library surface and improve maintainability.
  • Bumped package version (0.2.6 → 0.2.7).

[coderabbitai]

📝 Walkthrough

Walkthrough

Reorganized src/models/index.ts to expand and reorder public exports, reintroducing previously removed modules and adding many new model export entries; bumped package version in package.json.

Changes

Cohort / File(s)	Summary
Models index export reorganization src/models/index.ts	Reordered and expanded the public export surface: removed a smaller top export block and reintroduced a broader set of exports later, adding many model modules (e.g., AgentRun, Epic, Initiative, InitiativeLabel, Intake, Label, Link, OAuth, WorkItemRelation, WorkItemType, WorkLog, WorkspaceFeatures) and restoring others (Comment, Project, ProjectFeatures, WorkItem, WorkItemProperty, etc.).
Package metadata package.json	Version bump from 0.2.6 to 0.2.7. No other fields changed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐇 I hopped through index lines so wide,

New exports gathered at my side,
AgentRuns and Epics play,
Labels, Links, and WorkLogs sway,
A tidy meadow, exports spread—hooray! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: add missing model exports' accurately describes the main change—reorganizing and expanding exports in src/models/index.ts to include previously missing model modules.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/add-missing-model-exports

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