chore(release): bump workspace version to 0.13.0

[cscheid]

Prepares the v0.13.0 release (bd-5vjlvbg9), per
claude-notes/instructions/release-runbook.md step 2.

The release workflow's preflight job fails unless the git tag exactly
equals [workspace.package].version, so the manifest is bumped before
v0.13.0 is tagged.

What's in the release

Scope is main as-is — no open PRs pulled in. Commits since v0.12.0:

• 0e2d8898 Don't lex < text (whitespace after <) as html_element (bd-ly83qewg, Don't lex '< text' (whitespace after '<') as html_element (bd-ly83qewg) #469)
• b0f67b43 Resolve leading-/ include paths against the project root (bd-w9koo1i2, Resolve leading-/ include paths against the project root (bd-w9koo1i2) #468)
• 9e19d757 Expand {{< include >}} at every block-list position (bd-1fz3vh99, Expand {{< include >}} at every block-list position (bd-1fz3vh99) #467)
• c55468e1 .md render support, Phases 1–6 (bd-6d2wj4zp, .md render support: explicit render-list opt-in, engines ignored with warning (bd-6d2wj4zp) #466) — render-list opt-in discovery, Q-2-40 engine-ignored warning, single-file format detection + self-overwrite guard, nav/body links + dependency-graph edges, preview + hub sync/watch + hub-client surfaces, user docs
• b3465b7a Include failures: surface inner parse errors, drop spurious Q-16-3 (bd-qpvoamvu, Include failures: surface inner parse errors, drop spurious Q-16-3 (bd-qpvoamvu) #465)
• 3b3da492 chore: refresh wasm-quarto-hub-client Cargo.lock for the 0.12.0 bump
• 9249c43d temporarily remove issue template

Changes here

Cargo.toml [workspace.package].version 0.12.0 → 0.13.0, plus the
cargo update --workspace lockfile rewrite. Diffing Cargo.lock for
version lines that are neither 0.12.0 nor 0.13.0 returns nothing, so
no external dependency moved — only workspace members.

crates/wasm-quarto-hub-client/Cargo.lock (excluded from the workspace,
so cargo update --workspace doesn't reach it) is refreshed by the same
bump: 17 workspace version lines, no dependency changes. It was produced
by cargo xtask verify's hub-build leg, same as 3b3da492 did for 0.12.0.

Verification

• cargo build --bin q2 --locked succeeds and prints q2 (quarto 2) 0.13.0.
  The --locked build is the real gate: CI builds --locked, so the
  lockfile had to already be in sync.
• Full cargo xtask verify (not --skip-hub-build) — all 14 steps
  green: custom lints, clippy -D warnings, rustfmt, cargo build --workspace, cargo nextest run --workspace, ts-packages build + MCP
  smoke check, hub-client build:all (including WASM), hub-client
  test:ci, and the q2-preview-spa bundle.

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