fix: repo review cleanup — CI, eval harness, manifests, and docs

[samhita-alla]

CI (.github/workflows/skill-evals.yml):

• quote the flyte pin: unquoted 'flyte>=2.5.0' was a shell redirect that installed unconstrained flyte and wrote pip output to a file named '=2.5.0'
• add a harness-tests job so the evals unit tests actually run in CI
• trigger the workflow on changes to itself

Eval harness:

• select.py: map evals/scenarios//** changes to that skill so scenario-only PRs run evals instead of skipping them
• evaluate.py: fix the expect_status tautology (X and (Y or X)) that made real_run.expect_status never actually assert
• runners/base.py: exclude .hermes and opencode.json from workspace snapshots (.hermes leaked the installed SKILL.md into judge prompts as agent output, inflating treatment scores; opencode.json leaked the GLM API key)
• eval_wf.py: surface failed flyte.map elements as errored scorecard rows via a new errored_scenario() helper instead of silently dropping them
• test_report.py: rewrite stale pass/fail-era tests against the rating-based report, covering the skipped/errored/regression paths

Config:

• commit .agents/plugins/marketplace.json — the canonical Codex marketplace path per the OpenAI plugin spec — with a description on the plugin entry
• align the plugin descriptions across all four manifests
• marketplace description: 'Claude Code skills' -> 'Agent skills' (the repo also targets Codex, Hermes, opencode, and pi)
• bump package.json to 0.3.0 to match the plugin manifests
• gitignore .venv/, *.egg-info/, *.zip, __MACOSX/

Docs:

• READMEs: lead with the plugin being for Claude Code and OpenAI Codex (full plugin incl. MCP servers) plus any Agent Skills harness, and give Codex its own install section — it gets the MCP servers, not just skills
• root README: deploy-flyte-kind supports DigitalOcean only (EC2/GCP belong to deploy-flyte-kind-vm); standardize 'Flyte v2' -> 'Flyte 2'
• flyte-sdk-types: FlyteFile (a Flyte 1 type) -> flyte.io.File
• deploy-flyte-kind description: mention the OIDC auth the skill covers