feat(docs): add brief and brand reference docs to phase-2 branch

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/brief/target-audience.md

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+<!-- Source: Kon Master Brief — §2 Target Audience -->
+
+## 2. Target Audience
+
+**Primary beachhead:** Neurodivergent individuals (ADHD, autism, executive dysfunction) who need a non-judgmental, low-cognitive-load tool for organising their thoughts and tasks.
+
+**Secondary audiences (post-validation):**
+- Writers and creatives who need to brain dump and structure ideas
+- TTRPG game masters (session transcription, pulling key details from games)
+- Privacy-conscious professionals (legal, medical, security-compliant industries)
+- Anyone who does significant note-taking or typing and would benefit from voice-to-text
+
+**Beachhead first.** Validate with neurodivergent users before expanding messaging to secondary audiences.