docs: add shared guide content

[pratyush618]

Second slice of the docs SDK-parity work: fill the Python-only holes in the shared guide tree so Node and Java readers get the same content — real ported examples where the feature ships, honest callouts where it doesn't. Every ported API verified against SDK source. 12 commits.

Core guides

• tasks: unified "Defining a task" example; ported task naming to Node/Java; callouts for expires / direct-call / per-task-middleware / per-task-serializer (all feature-absent in Node/Java).
• queues: queue-level defaults — Node callout (per-task only), Java per-task descriptor.
• workers: worker tags + lifecycle events — feature-absent in Node/Java, now honest callouts.
• predicates: Node + Java worked examples; DSL/persistence/metrics gap callouts.

Workflow guides

• canvas: chunks/starmap → Node/Java group-build snippets; canvas-vs-DAG notes.
• saga: continue-mode compensation + events — Node/Java callouts.
• gates: gate conditions + events — Node/Java callouts.

Reliability / extensibility / integrations

• serializers: Node + Java serializer-selection matrix.
• prometheus: real Java Micrometer→Prometheus section (was a 2-line stub).
• retries: Node custom-backoff block.
• guarantees: Java idempotency example fixed to show real dedup.

Also

• fix: stop decimal ::marker overlapping the .flowsteps step badges (Architecture → Mesh) — scoped the decimal-list rule to .article ol:not(.flowsteps).

Parity gate, typecheck, and static build all pass.

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📥 Commits

Reviewing files that changed from the base of the PR and between 420a62d and f8f7762.

📒 Files selected for processing (12)

• docs/app/styles/docs.css
• docs/content/docs/shared/guides/core/predicates.mdx
• docs/content/docs/shared/guides/core/queues.mdx
• docs/content/docs/shared/guides/core/tasks.mdx
• docs/content/docs/shared/guides/core/workers.mdx
• docs/content/docs/shared/guides/extensibility/serializers.mdx
• docs/content/docs/shared/guides/integrations/prometheus.mdx
• docs/content/docs/shared/guides/reliability/guarantees.mdx
• docs/content/docs/shared/guides/reliability/retries.mdx
• docs/content/docs/shared/guides/workflows/canvas.mdx
• docs/content/docs/shared/guides/workflows/gates.mdx
• docs/content/docs/shared/guides/workflows/saga.mdx

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• Create PR with unit tests
• Commit unit tests in branch docs/parity-shared-guides

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