feat: peek grep mode + get_issues filtering/read-one (ctxpeek 1.0)

[tamimbinhakim]

Cuts ctxpeek 1.0 and lands two feature areas plus stabilization. Tool surface stays at 10 tools.

peek — grep mode + limits + edge cases

• Grep mode: pass query to find every match inside a named file and get each back with context lines around it. Literal by default; regex: true for patterns; ignore_case (default true). Overlapping windows merge into single chunks. Deterministic, single-file grep — no vectors, so it stays inside the project's stated "no semantic search" philosophy.
• Limits: max_line_length truncates over-long lines (both modes) so a minified/data line can't blow the context window; max_matches caps grep results with an explicit "+N more" note; n (head mode) is capped.
• Edge cases: binary files (NUL byte in first 8 KB) and empty files are reported, never dumped; no-match queries return a friendly note (not an error); invalid regex reports the syntax error; ~tokens reflects the returned payload.
• Logic extracted to pure, unit-tested format/peekText.ts.

get_issues — filtering + read-one

• Filters: labels, author, assignee, since, sort/order (updated/created/comments) on top of existing state/type. REST + GraphQL now share one query builder (fetch/issueQuery.ts) so filtering behaves identically on both paths.
• Read one: pass number to fetch a single issue/PR's full body plus its first comments comments, via new GithubRestClient.getIssue / getIssueComments.

Stabilization

• +31 unit tests (123 total). Build, typecheck, lint (js/py/md), and MCP integration-boot all green.
• Verified end-to-end against live repos (head/grep/no-match/binary; issue read-one + filtered search).
• Docs updated: docs/reference/tools.md, README.md, docs/internals/architecture.md.

Release

Changeset bumps ctxpeek 0.1.3 → 1.0.0 (major). On merge, the changesets action opens a "version packages" PR; merging that publishes ctxpeek@1.0.0 to npm via trusted publishing (OIDC provenance).

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