fix(telegram): stabilize reply dispatch runtime

Summary:
- Add a stable provider-dispatcher dist entry and legacy alias coverage for stale reply-dispatch chunks.
- Make Telegram reasoning stream previews transient after final delivery and harden visible-send reasoning sanitization.
- Document transient /reasoning stream behavior and credit @BunsDev in the changelog.

Verification:
- pnpm test src/agents/tools/message-tool.test.ts src/infra/tsdown-config.test.ts test/scripts/runtime-postbuild.test.ts extensions/telegram/src/bot-message-dispatch.test.ts src/plugin-sdk/channel-streaming.test.ts src/plugin-sdk/channel-entry-contract.test.ts
- OPENCLAW_VITEST_MAX_WORKERS=1 pnpm test src/channels/plugins/module-loader.test.ts src/plugin-sdk/channel-entry-contract.test.ts
- pnpm exec oxfmt --check --threads=1 <changed files>
- git diff --check
- pnpm build
- GitHub PR checks for b8b7a91834

tsdown.config.ts

@@ -242,6 +242,7 @@ function buildDockerE2eHarnessEntries(): Record<string, string> {
       "src/agents/pi-embedded-runner/effective-tool-policy.ts",
     "agents/pi-embedded-runner/run/runtime-context-prompt":
       "src/agents/pi-embedded-runner/run/runtime-context-prompt.ts",
+    "auto-reply/reply/provider-dispatcher": "src/auto-reply/reply/provider-dispatcher.ts",
     "auto-reply/reply/commands-crestodian": "src/auto-reply/reply/commands-crestodian.ts",
     "cli/run-main": "src/cli/run-main.ts",
     "commitments/runtime": "src/commitments/runtime.ts",