feat(daemon): layer mount extensions on mount core

Author: 0xpatrickbot

.changeset/add-endo-hex.md

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+---
+'@endo/pubsub': major
+---
+
+Add `@endo/pubsub` package: local-layer pubsub topics over a shared async promise linked list (the Sink + Spring convention).
+Ships `makeChangeTopic` (lossless deltas: every subscriber sees every value published after iteration begins), `makeLatestTopic` (lossy: subscribers see only the most-recent value), and the underlying `makePubSub` sink+spring primitive, each as its own subpath export (no barrel module).
+Cancellation is provided by `@endo/cancel` rather than a bundled primitive.
+Incubates on the `llm` roadmap branch ahead of projection to `master` (precipitated by PR #507 design review).

.changeset/add-endo-pubsub.md

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+---
+'@endo/tar': minor
+---
+
+Add `@endo/tar`, a minimal, portable read-only tar archive parser. Mirrors `@endo/zip` as the tar-side counterpart, extracted from the daemon's Git-tree archiving path, and reads the entries `git archive --format=tar` emits (regular files, directories, symlinks, and pax extended headers).

.changeset/add-endo-tar.md

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+---
+'@endo/agent-tools': minor
+---
+
+Name each git tool's parameters from its method instead of the generic `arg0`/`arg1` convention. `gitToolSchemas` now declares real, declarative property names that read as an LLM-facing signature (`commit` → `message`, `show` → `ref`, `createBranch` → `name`/`options`, `switchBranch` → `branch`, `log`/`diff` → `options`), and `makeTool` marshals the named-args record into positionals by each schema's declared `parameters.properties` order and `required` set rather than the hardcoded `argN` keys. Arity, required-key validation, and the schema-to-guard parity are preserved.

.changeset/agent-tools-named-tool-params.md

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+---
+'@endo/bytes': minor
+'@endo/ocapn': patch
+---
+
+Add `bytesToImmutable` and `bytesFromImmutable` to `@endo/bytes` for moving between mutable `Uint8Array` views and hardened immutable `ArrayBuffer` instances backed by the proposal-immutable-arraybuffer shim.
+
+`@endo/ocapn` retires its `src/buffer-utils.js` collection of ad-hoc helpers in favor of these and the existing `@endo/bytes` exports plus `decodeHex` from `@endo/hex`, addressing reviewer feedback on the `@endo/bytes` introduction (PR #142, follow-up #223).

.changeset/base64-harden.md

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+---
+'@endo/cancel': major
+---
+
+Initial release of `@endo/cancel`, a cooperative cancellation primitive built around a `Cancelled` token (a `Promise<never>` that only ever rejects) and a `makeCancelKit` factory that pairs the token with a `cancel` function and a synchronous `isCancelled` observation function.
+
+Includes cancellable operators (`allMap`, `anyMap`) that propagate cancellation to children on first failure or first success respectively, a `makeDelay`-backed `delay` that races a timer against parent cancellation, and bidirectional `AbortSignal` interop (`toAbortSignal`, `fromAbortSignal`).
+
+The design anticipates a future `Promise.withCanceller` API; the kit shape is chosen so callers can migrate by swapping the factory rather than rewriting call sites.

.changeset/base64-native-fallthrough.md

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+---
+'@endo/daemon': patch
+'@endo/cli': patch
+---
+
+Adopts `@endo/cancel`'s `makeCancelKit` at the daemon and CLI call sites where the previous pattern composed `makePromiseKit` with a one-shot sink-rejection. The new kit expresses the same cancellation graph without the `makePromiseKit` boilerplate; no observable behavior change.