chore: fix TypeScript + ESLint no-redeclare + add CI workflow

[jaschadub]

Summary

Brings `npm run type-check`, `npm run build --workspaces`, and a new `.github/workflows/ci.yml` to a clean, green state. Fixes 16 long-standing TypeScript errors, unblocks the ESLint `no-redeclare` false-positive on the `@symbi/types` enum-like pattern, and wires CI for the repo (which had no workflows at all).

TypeScript fixes

`MarkdownMemoryStore` (1 error)

Narrow `currentSection` to the `'facts' | 'procedures' | 'learned_patterns'` union so indexing `ctx[currentSection]` is type-safe without casting.

`SkillScanner` (1 error)

Drop a bogus `as const` on an enum member reference.

Qdrant client (13 errors)

Align `CollectionManager`, `SearchEngine`, and `VectorOperations` with the qdrant-js 1.15.1 API surface:

• `optimizer_config` → `optimizers_config` in `createCollection`
• `getCollection` no longer returns `name`; use caller-supplied `collectionName`. Widen `status` (`"grey"` → `"red"`) and `optimizer_status` (`{error: string}` → `"error"`) to match our stricter `CollectionInfo` schema. Map `response.config` defensively through optional fields.
• `createAlias` / `deleteAlias` removed from `QdrantClient`; rewrite to use `updateCollectionAliases({actions: [{create_alias|delete_alias}]})`.
• `search({vector: {id}})` no longer supported; implement `searchByPointId` as retrieve-then-search.
• `recommend` positive/negative now take IDs directly (`string | number` or raw vectors), not `{id}` wrappers.
• `discover` renamed to `discoverPoints`; flatten context pairs; target accepted bare.
• `VectorOperations.getPoint` / `scrollPoints`: narrow `point.id` through `String()`, `point.vector` through `Array.isArray`, cast payload through `Record<string,unknown>|undefined`; stringify `next_page_offset` when present.

All existing qdrant unit tests updated to match the new mock call shapes.

ESLint fixes

• Add jest globals (`expect`, `test`, `describe`, `beforeEach`) plus `NodeJS` and `BufferEncoding` type globals. Brings error count from ~130 to ~43.

• Turn off both `no-redeclare` and `@typescript-eslint/no-redeclare` in TS files. TypeScript already catches real redeclares at compile time, and both rules false-positive on the value+type enum-like pattern used throughout `@symbi/types`:

  ```ts
  export const WebhookProviderType = { ... } as const;
  export type WebhookProviderType = typeof WebhookProviderType[keyof typeof WebhookProviderType];
  ```

Remaining 43 lint errors are pre-existing unused-imports and `no-case-declarations` in CLI / tests — out of scope for this change, tracked as incremental cleanup.

CI workflow

New `.github/workflows/ci.yml`:

• test job — matrix on Node 18 / 20 / 22:
  1. `npm ci`
  2. `npm run build --workspaces`
  3. `npm run type-check`
  4. `npm run lint --workspaces --if-present` (non-blocking; pre-existing debt)
  5. `npx vitest run`
• build-artifact job (after test passes): packs each workspace package with `npm pack` plus the root package, uploads as a PR artifact so reviewers can spot publish-shape regressions.
• `concurrency` cancels in-progress runs when a branch is re-pushed.

Test plan

• `npm run type-check` — 0 errors (was 16)
• `npm run build --workspaces` — all 9 packages build cleanly
• `npx vitest run` — 1082/1082 tests pass across 35 files
• `npx eslint packages/types/src/webhook.ts` — clean (was 2 no-redeclare errors)