feat(workflows): expand template library from 9 to 22 + multiline string cleanup (#36)

* feat(workflows): add 13 workflow templates across engineering, business, and productivity

Engineering:
- bug-triage: reproduce path → root cause → fix plan
- api-design: resource model → endpoints → OpenAPI spec
- incident-postmortem: timeline → RCA → full postmortem report
- test-generation: code analysis → edge cases → full test suite
- refactor-plan: smell analysis → prioritised opportunities → migration plan

Business:
- competitor-analysis: profiles → SWOT → strategy report
- product-spec: problem definition → user stories → full PRD
- market-research: landscape → segments → research report

Productivity/Thinking:
- meeting-summary: raw notes → structured summary → follow-up email
- decision-matrix: criteria → weighted scoring → recommendation memo
- learning-plan: gap analysis → roadmap → week-1 day-by-day plan
- job-application: job analysis → tailored resume → cover letter → interview prep
- blog-post: research → outline → draft → SEO optimisation

Closes #1912 on librefang/librefang

* fix(workflows): overhaul existing 9 templates

- data-pipeline: redesigned — original 'extract from URL' step was
  broken (LLMs cannot fetch URLs); replaced with paste-data approach
  (profile → clean_transform → analyse) with analysis_goal parameter
- translate-polish: added target_language and register parameters;
  added back-translation step for accuracy verification
- weekly-report: added team/audience parameters, richer extraction
  step, added Metrics and Notes sections
- content-pipeline: added audience/tone parameters, added outline step
  between research and writing
- content-review: fix category 'content' → 'creation'
- customer-support: fix category 'support' → 'business'

* style(workflows): convert all prompt_template strings to TOML multiline syntax

Replace \n escape sequences with real newlines using triple-quote
multiline strings ("""...""") across all 22 workflow templates.
No content changes — formatting only.

* style(hands): replace \n escape in reddit writer format example with multiline code block

workflows/learning-plan.toml

@@ -0,0 +1,86 @@
+id = "learning-plan"
+name = "Personalised Learning Plan"
+description = "Assess current knowledge, identify gaps, and build a structured learning roadmap with resources and milestones."
+category = "productivity"
+tags = ["learning", "education", "planning", "productivity"]
+
+[i18n.zh]
+name = "个性化学习计划"
+description = "评估当前知识水平，识别差距，构建带资源和里程碑的结构化学习路线图。"
+
+[[parameters]]
+name = "skill"
+description = "The skill or subject to learn"
+param_type = "string"
+required = true
+
+[[parameters]]
+name = "current_level"
+description = "Your current knowledge and experience with this topic"
+param_type = "string"
+required = false
+default = "complete beginner"
+
+[[parameters]]
+name = "goal"
+description = "What you want to be able to do once you've learned it"
+param_type = "string"
+required = false
+default = "professional proficiency"
+
+[[parameters]]
+name = "time_available"
+description = "Hours per week available for learning"
+param_type = "string"
+required = false
+default = "5 hours per week"
+
+[[steps]]
+name = "gap_analysis"
+prompt_template = """
+You are an expert educator in {{skill}}. Analyse the learner's situation:
+1. **Knowledge map** — the full topic broken into sub-skills and concepts
+2. **Current position** — what they likely know given their stated level
+3. **Target position** — what they need to know to reach their goal
+4. **Critical gaps** — the 5 most important things to learn first
+5. **Common pitfalls** — mistakes beginners make, concepts people find hardest
+
+Skill: {{skill}}
+Current level: {{current_level}}
+Goal: {{goal}}
+"""
+
+[[steps]]
+name = "roadmap"
+prompt_template = """
+Design a learning roadmap divided into phases. For each phase:
+- Name and duration estimate
+- Learning objectives (what they'll be able to do)
+- Core concepts to master
+- 3-5 specific resources (books, courses, docs, tutorials — real names where possible)
+- Practice project or exercise
+- How to know the phase is complete (milestone)
+
+Time available: {{time_available}}
+
+Gap analysis:
+{{gap_analysis}}
+"""
+depends_on = ["gap_analysis"]
+
+[[steps]]
+name = "week1_plan"
+prompt_template = """
+Create a concrete day-by-day plan for the first week of learning. For each day:
+- Specific topic to cover
+- Exact resource to use (chapter, video, section)
+- Time estimate
+- Exercise or thing to build/practice
+- End-of-day check: how to verify understanding
+
+Assume {{time_available}} is available.
+
+Roadmap:
+{{roadmap}}
+"""
+depends_on = ["roadmap"]