fix(fixer): create the 'blocked' label if missing and add a self-gated outcome

[carlos-alm]

Problem

Two compounding gaps in the /fixer skill (issue #2324):

1. The blocked label never existed in this repo. /fixer's Phase 1 queue filter and Phase 3 batch-completion check both exclude issues carrying a blocked label, but nothing had ever created that label here — so the exclusion was a silent no-op in every run to date.
2. No way to apply it automatically for a common outcome class. An issue that is deliberately self-gated (explicitly written to stay open until some future trigger condition, e.g. "only take this on if/when a real caller needs it") was re-verified and re-confirmed unmet on every batch it was eligible for, forever, wasting a queue slot each time.

Fix

• Phase 0 now creates the blocked label tolerantly (gh label create blocked ... || true) so it actually exists to filter on.
• Step 2b gets a new self-gated outcome, parallel to abandoned: when an issue is explicitly self-gated and its trigger condition is still unmet, apply the blocked label with a comment naming the condition, record status self-gated, and move on — leaving the issue open (unlike abandoned, which closes it) but no longer re-entering the queue until a human removes the label.
• self-gated is propagated through every place the skill enumerates terminal statuses: progress counters, the dispatch-loop guard, the sub-agent stop condition, the final report table, and the artifacts reference table.

This is a change to the skill's own orchestration logic only (.claude/skills/fixer/SKILL.md), not application source.

Test plan

• Extracted and bash -n-checked all 41 \``bash` blocks in the edited file (including the 2 new ones) — no syntax errors
• Existing SKILL.md-extraction regression tests still pass: fixer-skill-2g-queue-guard-2304, fixer-skill-2g-queue-guard-2229, docs-skills-mirror-sync (fixer is not a titan-* skill, so it has no mirror), lint-skill-mktemp-trailing-x
• Full test suite: 5231/5231 passed, 324/324 files
• npm run lint clean
• cargo build --release and cargo fmt --check clean (no application code changed by this PR, verified anyway)

Closes #2324

[greptile-apps]

Greptile Summary

The fixer skill now provisions the blocked label during pre-flight and adds a terminal self-gated outcome for issues awaiting an explicit future trigger.

• Propagates self-gated through queue advancement, progress accounting, dispatch validation, reporting, and artifact documentation.
• Labels qualifying issues as blocked while leaving them open for later human reactivation.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.claude/skills/fixer/SKILL.md	Adds blocked-label provisioning and consistently integrates the self-gated outcome throughout fixer orchestration.

_{Reviews (2): Last reviewed commit: "fix(fixer): don't swallow genuine gh lab..." | Re-trigger Greptile}