test: md-only PR — final ci-complete gate verification

[spomichter]

Pure md-only change off dev (after #1286 merged). Expected behavior:

• check-changes: all outputs false
• All test jobs: skipped (job-level if: evaluates to false)
• All build jobs: skipped or success (no changes)
• ci-complete: passes (no failures/cancellations)

Do NOT merge — delete after verification.

[greptile-apps]

Greptile Summary

This PR adds a single temporary markdown file (docs/ci-gate-test.md) to verify that the ci-complete gate introduced in #1286 correctly handles docs-only changes: all path-filtered test and build jobs should be skipped, and ci-complete should still pass since no jobs fail or are cancelled.

• Only docs/ci-gate-test.md is added — no source code, CI workflow, or configuration changes.
• The check-changes path filter in docker.yml monitors dimos/**, docker/**, and workflow files. A docs/ change matches none of these, so all outputs (ros, python, dev, navigation, tests) will be false.
• All dependent build and test jobs (ros, python, dev, ros-python, ros-dev, run-tests, run-heavy-tests, run-lcm-tests, run-integration-tests, run-ros-tests, run-mypy) should be skipped.
• ci-complete runs with if: always() and only fails if a job result is failure or cancelled; all skipped jobs satisfy this condition.
• The PR description explicitly states Do NOT merge — delete after verification, which is appropriate for a temporary verification commit.
• One observation: the navigation job is not included in ci-complete's needs list. This is pre-existing and unrelated to this PR, but means a navigation build failure would not block the gate.

Confidence Score: 5/5

• This PR is safe — it adds only a temporary documentation file with no impact on production code or CI logic.
• The change is a single 4-line markdown file in docs/. It introduces no code, no configuration changes, and no CI modifications. The sole purpose is to exercise the existing ci-complete gate for a docs-only scenario, as described in the PR. There is nothing that could cause a regression.
• No files require special attention.

Important Files Changed

Filename	Overview
docs/ci-gate-test.md	New temporary markdown file added solely to trigger a docs-only CI run for gate verification; no code or logic changes.

Flowchart

flowchart TD
    A[PR Push - docs/ci-gate-test.md only] --> B[check-changes]
    B -->|ros: false| C[ros: SKIPPED]
    B -->|python: false| D[python: SKIPPED]
    B -->|dev: false| E[dev: SKIPPED]
    B -->|navigation: false| F[navigation: SKIPPED]
    B -->|tests: false| G[tests filter: false]
    C --> H[ros-python: SKIPPED]
    H --> I[ros-dev: SKIPPED]
    D --> J[dev build: SKIPPED]
    G --> K[run-tests: SKIPPED]
    G --> L[run-heavy-tests: SKIPPED]
    G --> M[run-lcm-tests: SKIPPED]
    G --> N[run-integration-tests: SKIPPED]
    I --> O[run-ros-tests: SKIPPED]
    I --> P[run-mypy: SKIPPED]
    B & C & D & H & J & K & L & M & N & O & P --> Q[ci-complete]
    Q -->|no failures/cancellations| R[✅ CI passed]

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[greptile-apps]

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[spomichter]

Gate verified ✅ — md-only PRs now skip all test jobs instantly. ci-complete passes.