docs: add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- **`/perplexity-config` command** — Interactive configuration for default model and incognito mode, stored at `~/.config/pi-perplexity/config.json`
+- **Model selection** — New `model` parameter on `perplexity_search` tool to choose Perplexity backend model (Sonar, GPT-5.4, Claude 4.6 Sonnet Thinking, Gemini 3.1 Pro, Deep Research, etc.)
+- **Incognito toggle** — New `incognito` parameter to control whether searches appear in Perplexity web history
+- **Config priority chain** — Per-call params → env vars (`PI_PERPLEXITY_MODEL`, `PI_PERPLEXITY_INCOGNITO`) → config file → defaults
+- **Config display in TUI** — Render components now show model and incognito status
+
+### Changed
+
+- Auto-clear cached token on auth rejection instead of requiring manual `/perplexity-login --force`
+
+### Fixed
+
+- Restore error rendering and safe error handling in search client
+- Apply config defaults to Perplexity UI settings
+- Simplify current model label in config
+- Isolate tests from `mock.module` cache pollution
+
+## [0.1.3] - 2026-02-23
+
+### Added
+
+- `pi-extension` keyword for pi package discovery
+
+## [0.1.2] - 2026-02-23
+
+### Fixed
+
+- Fix install commands in README
+- Fix tag pattern to match v-prefixed tags
+- Strip v prefix in version check
+- Simplify README description
+
+## [0.1.1] - 2026-02-23
+
+### Added
+
+- Perplexity web search tool (`perplexity_search`) for pi coding agent
+- macOS desktop app token extraction (zero-interaction auth)
+- Email OTP fallback authentication flow
+- SSE stream client for Perplexity's internal API
+- Source formatting with age, snippets, and deduplication
+- TUI render components for tool calls and results
+- Token persistence with secure file permissions
+- npm publish GitHub Actions workflow with OIDC trusted publishing
+- MIT license
+
+### Technical
+
+- Zero runtime dependencies — uses platform globals only
+- Incremental SSE event merging with block-level deduplication
+- JWT expiry tracking with 5-minute buffer