Add CHANGELOG.md with release notes

Documents 2.1.0 (import command, manifest updates), 2.0.0 (8 personas,
12 modalities, split architecture), and 1.0.0 (initial release).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

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+# Changelog
+
+All notable changes to Inner Dialogue.
+
+---
+
+## [2.1.0] - 2025-02-08
+
+### Added
+- **Import command** — Import notes anytime during a session, not just at setup. Say "import" or "I have files to import" and provide a path.
+- **Manifest-based updates** — Updates now use `manifest.json` to discover all available components. Existing users can get new features automatically.
+
+### Changed
+- **Smarter import handling** — Imported files now become session history (`sessions/YYYY-MM-DD.md`) with original dates, plus key patterns extracted to `profile.md`. This gives natural relevance decay like real memory.
+- **Commands moved to updatable file** — Customization commands now live in `.therapy/commands.md` so existing users receive new commands via updates.
+
+### For Existing Users
+Run "update" or "check for updates" during a session to get these features.
+
+---
+
+## [2.0.0] - 2025-02-01
+
+### Added
+- **8 communication styles** (up from 2):
+  - Warm 4o-Style
+  - Direct & Challenging
+  - Warm & Supportive
+  - Coach
+  - Grounded & Real
+  - Contemplative & Spacious
+  - Philosophical & Existential
+  - Creative & Playful
+
+- **12 therapeutic modalities** (up from 1):
+  - CBT (Cognitive Behavioral Therapy)
+  - ACT (Acceptance and Commitment Therapy)
+  - CFT (Compassion-Focused Therapy)
+  - DBT Skills
+  - IFS (Internal Family Systems)
+  - Lifespan Integration
+  - Motivational Interviewing
+  - Narrative Therapy
+  - Polyvagal-Informed Work
+  - Psychodynamic
+  - SFBT (Solution-Focused Brief Therapy)
+  - Somatic Experiencing
+
+- **Split-file architecture** — Components now live in `.therapy/` folder for independent updates
+- **Self-contained therapist folders** — No need to keep the repo after setup
+- **Update command** — Say "update" to check for and apply updates from GitHub
+- **Customization commands** — Switch persona, add/remove modalities, change session structure during sessions
+
+### Changed
+- Therapist folders now include full library of options for switching styles
+
+---
+
+## [1.0.0] - 2025-01-15
+
+### Initial Release
+- Basic AI therapist setup with persistent sessions
+- CBT modality
+- Warm 4o-Style and Coach personas
+- Session notes saved to `sessions/` folder
+- Client profile in `profile.md`
+- Safety and crisis protocols